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Space Tourism: How to Visit Space as a Tourist

Last updated: August 28, 2023 . Written by Laurence Norah - 4 Comments

Despite the name of this blog, I have been distressingly earth bound for all of my years thus far. Given recent developments in space exploration technology though, hope is not yet lost for the dream of going into space as a tourist – without having to shell out the millions of dollars that past tourists have paid!

In today’s post, I’m going to talk about a few things. I’m going to cover where space travel & exploration is today.

I’m going to talk about what options we have now, and may have in the future, for getting into space as a tourist. And I’m also going to cover a few ways those of us stuck on Earth without access to a giant pile of cash can still get our space fix around the world!

Table of Contents:

The State of Space Travel as a Tourist in 2023

Huge strides are happening right now in space exploration, particularly with private companies looking at opening up space to your average person. Admittedly, right now, space tourism isn’t exactly accessible.

Up to 2009, only 7 people made it into space as tourists, all travelling with the Russian Space Agency, and all paying in excess of USD $20 million.

These weren’t exactly hop-on hop-off trips either, with the participants undergoing months of training, and many of them actively running their own experiments in space. So to call them space tourists is perhaps a bit of a misnomer.

However, things have now changed, and trips into space are becoming more affordable. Admittedly, they aren’t exactly “budget”, but they are less than $20 million a go.

So what’s changed?

Well, put simply, private investment. Whilst massive government organisations like NASA , the Russian Space Agency and the European Space Agency are always researching and expanding their space exploration efforts, their focus isn’t exactly on getting folks like you and me into space – at least not in the near term. Their focus is on long term scientifically focused exploration missions, with perhaps the most exciting being NASA’s Journey to Mars .

Other organisations though, see the potential for space based tourism as a way to generate funds and publicity for their projects. There are three main players in the space tourism business right now – Virgin Galactic , SpaceX and Blue Origin .

Let’s take a look at the main players with whom you have a real chance of getting into space within the next few years.

How to Go To Space As A Tourist

Other than flagging down a passing UFO Ford Prefect style, or signing up to be an astronaut with a government agency, getting into space is a bit tricky. But that’s all changing, and these are the companies with whom you are most likely to be able to travel into space.

1. Virgin Galactic

Part of the Virgin Group headed up by Sir Richard Branson, Virgin Galactic currently offers sub-orbital flights to paying passengers aboard their SpaceShipTwo and SpaceShipThree craft.

Sub-orbital means that you’re not high enough to actually orbit the earth, but as the goal you do pass the 100km line that marks the edge of space, you will technically be in space, and also experience weightlessness. Hurrah!

The good news is that as of June 2023, commercial space flights have actually commenced. Trips are scheduled to go monthly, and you can now buy tickets for a voyage into space with Virgin Galactic. They are currently on sale for $450,000.

Admittedly, $450,000 USD isn’t exactly small change, but it’s a lot less expensive than the $20 million that previous space travellers have paid. For your money, you get three days of training at Spaceport America in New Mexico, a flight into space, a somewhat incredible view and a period of weightlessness. Not too bad.

2. Blue Origin

Owned by Amazon billionaire Jeff Bezos, Blue Origin is a private company which initially appeared to be focusing on sub-orbital flight, much like Virgin Galactic.

Unlike Virgin Galactic though, which uses a combination of a normal plane and a rocket plane to achieve the necessary space altitude, Blue Origin are using more conventional rocket technology, with a focus on re-usable components that cut the cost of launches.

Other than the spacecraft, the experience is largely the same – a sub-orbital flight that comprises a few days of training in Texas, a journey lasting around 11 minutes to up beyond the 100km line, weightlessness and some incredible views.

The technology to do this will look familiar to any fans of existing space flight technologies, including the capsule that returns to Earth by parachute, meaning that there are fewer technical hurdles to overcome.

As of 2021, flights have commenced on the New Shepherd, with Jeff Bezos being the first into space. The ticket for the first commercially available seat in the July 2021 launch was auctioned off for a cool $28 million.

Since that launch, there have been a number of flights with paying customers.

Regular pricing isn’t set, although it’s currently rumored to be around $1 million per seat. A timeframe for general availability of commercial flights isn’t yet known. You can sign up to be kept informed and updated however.

Perhaps even more excitingly than the New Shepherd program is its successor – the New Glenn program. This should offer longer duration, possibly even orbital flights, although details are currently sparse on the ground, with operations aimed to launch in late 2024. We do know however that priority on these trips will be given to New Shepherd customers.

Last in our trio of serious contenders for firms that will take your money and send you into space in the next few years is SpaceX .

SpaceX is owned by Elon Musk, who is particularly famous for being the CEO and co-founder of Tesla Inc, the electric car and battery manufacturer, amongst other things.

SpaceX largely focuses on commercial launch capabilities, with a particular focus on reusable rocket technologies that bring down the cost of putting payloads into orbit.

They’ve been hugely successful in this field, with multiple achievements, including being the first privately funded company to successfully launch, orbit and recover a spacecraft.

They were also the first private company to send a spacecraft to the International Space Station, and have since flown many missions to the ISS.

Whilst the majority of their work is on commercial and government contracts for putting things like satellites into orbit, some recent developments have put SpaceX firmly on the space tourism map.

First, in 2017 they announced that they had been contracted by two private individuals who want to go on a trip around the moon. This was originally due to launch in 2018, but has been postponed until at least 2024. It will be by far the most ambitious space tourism endeavor to date by any company, and you can read more about the project here .

SpaceX are also starting to sell tickets on their Crew Dragon capsule, which is the launch system NASA is using to shuttle astronauts to the ISS. These are not generally available, but a 3-day mission consisting entirely of tourists took place in 2021, with further missions expected. These are still priced in the tens of millions of dollars though, so don’t bank on these becoming affordable for a while to come.

Next, SpaceX is actively working on technology to colonise Mars, with a lofty goal of setting up a permanent colony on the red planet, home to over a million people, within the next 100 years.

Whilst the current estimate of cost for such a ride is in the region of $10 billion USD per person, SpaceX is aiming to bring that down to $100,000 through the development of their Interplanetary Transport System . This won’t happen in the near-term, but by the end of the century tourism to Mars might be a real possibility, with lunar and earth-orbital flights the norm by then.

4. Other Contenders

So those are the main players who, in my opinion, have the most realistic chances of taking you to space in the coming decade. But they aren’t the only players in the space tourism arena! Here are a few others to be aware of who might give you a chance of getting off Planet Earth.

Bigelow Aerospace: Bigelow Aerospace are actually a pretty major name when it comes to space technology, and if you ever happen to find yourself in a hotel on the moon or floating around the Earth, it’s likely going to be inside one of their inflatable habitats.

This isn’t theoretical either, they’ve got an inflatable capsule attached to the International Space Station already undergoing feasibility testing. Owner Robert Bigelow made his fortune in hotels, and he sees no reason why we can’t have them in space too.

Space Perspective: Space Perspective are taking a slightly different approach to everyone else, in that their route to space is to fly passengers 100,000ft above the ground in capsule carried aloft by a gigantic hydrogen filled balloon.

Ok, so 100,000ft isn’t exactly space, but it is high enough to see the curvature of the earth. It’s likely to be a more sedate and relaxed experience as well, compared to firing yourself into space on some sort of rocket at least. And whilst experiencing zero-gee isn’t going to be on the cards, you should be able to enjoy the views from the wraparound windows whilst enjoying a tipple from the on-board bar!

Tickets for 2024 flights have already sold out, but you can book for 2025 at a cost of $125,000 per person.

Boeing: Boeing are currently under contract with NASA to build a crew transport vehicle that would be compatible with a number of rocket systems, primarily for the purpose of shuttling astronauts to the ISS. It was originally due to start those flights in late 2018. However, testing did not start until late 2019, and the current timetable for crewed flights is now 2023.

As part of their contract, this CST-100 Starliner was specified to include one seat specifically for the purposes of space tourism , allowing one passenger to just tag along for the ride as it were. For a price, naturally. That price is currently unknown, although the original goal was to have it price competitive with the Russian Space Agency, so don’t expect it to come under the tens of millions mark!

Mars One: Mars One was an organisation with a goal of establishing a permanent human colony on Mars by the year 2035. Announced in 2012, it encouraged members of the public to sign up for the one-way mission, which resulted in over 200,000 applicants. That was whittled down to 100, and then a final 24 candidates.

Unfortunately, the project was dogged by criticism, particularly around the technical and financial feasibility of the plan. Finally, Mars One entered administration in 2019.

The Best Space Sights and Activities on Earth

Ok, so based on all the above, you’re probably realising that space is still a pretty tough place to get to right now, and even over the next few years it’s still going to be pretty darn expensive for a fairly brief jaunt.

Don’t fret though. Planet Earth is a pretty cool place, and there are a lot of space-related activities you can take part in without re-mortgaging your house and strapping yourself to a rocket.

Here are a few places you can learn about space and space travel in the meantime! Let’s look at these.

1. Active Spaceports

Whilst you might not get into space right now, you can still visit a spaceport and dream of the future! I’ve picked three spaceports for you to think about visiting.

Spaceport America, USA. Set in the high New Mexican desert, Spaceport America is the world’s first purpose-built commercial spaceport, meaning it’s designed for commercial users. Yes, people like you and me. It’s the home base of Virgin Galactic, and is where that company will be operating from when they finally launch their space tourism flights. SpaceX also conduct some of their testing here. Unfortunately, you still can’t board a space trip here, but it’s a worthwhile place to visit, if only to get a tantalising glimpse of a possible future.

Kennedy Space Center, USA. Found in Florida, Kennedy Space Center is the main launch pad for NASA’s operations, and is where Apollo and Space shuttle launches took place. It’s a massive facility, spanning 144,000 acres. There’s a visitor centre on site, where you can learn all about NASA and it’s space operations, see an actual space shuttle and even experience a simulated space shuttle launch. Kennedy Space Center is still very much an active launch site, and you can also come here to watch rockets blast off into space – see their website for the launch schedule .

Baikonur Cosmodrome, Kazakhstan. One of the world’s most famous spaceports, and certainly the oldest and largest, Baikonur Cosmodrome is where the majority of Russia’s space program has operated from, including the first man into space, Yuri Gagarin. It’s still very active, and you can in theory visit, however prices are steep for a one day tour ($700+), and can only be arranged via a specialist tour operator in a complex process that needs to be booked weeks in advance.

2. Space Museums

As well as active space ports, there are a lot of museums around the world dedicated to sharing man’s activities in space. Here are a few of the best.

Space Center Houston, USA. The official visitor centre for NASA’s center for human spaceflight activities, Space Center Houston is an excellent place to come and learn all about NASA’s efforts around getting people into space. It has a number of artifacts from our explorations to date, including a lunar module replica and various actual capsules that have been into space. Tip – if you’re visiting a few sights in Houston, you can save money by investing in a CityPASS card which will get you into the Space Center as well as a number of other attractions in the city.

New Mexico Museum of Space History, USA. Found in Alamogordo in southern New Mexico, the five storey New Mexico Museum of Space History is full of information about man’s efforts to get into space, with everything from information on early rocket technology through to more modern day exhibits including a space shuttle landing simulator. It’s also home to the International Hall of Space Fame, a planetarium, and offers fantastic views across the White Sands National Monument.

Smithsonian National Air and Space Museum , USA . Found in Washington, D.C., this enormous museum is home to the world’s largest collection of historic aircraft and spacecraft in the world, including the Apollo 11 module and clothing worn by astronauts. With over 60,000 objects on display, you won’t run out of things to look at!

The National Space Centre, UK. Both a museum and an educational resource, the National Space Center in Leicester, UK, is home to six interactive galleries and the UK’s largest planetarium. A highlight though is the 42 metre high Rocket Tower , which houses a number of upright rockets, really giving you a feel for the enormity of these machines.

The U.S. Space and Rocket Center. Found in Huntsville, Alabama, right next door to NASA Marshall. The U.S. Space and Rocket Center has loads of information on the history of space flight, including two full size Saturn V rockets! This is also where you can attend Space Camp , a hands-on multi day training program for all ages, which will take you through a range of training similar to that which real astronauts do!

3. Space Themed Sights

We may be currently fairly stuck on the planet, but that doesn’t mean we’re not still hurtling through space, a small rock in a vast galaxy. Here are a few ways to help remind ourselves that there’s more out there than our horizon.

Meteor Craters. On our journey through space we regularly bump into errant lumps of space debris – around 100 tons a day in fact. Most often these lumps are so small (dust-specks really) that they just burn up in our atmosphere, creating beautiful shooting stars. However, anything larger than a marble has a chance of making to earth, although there are a lot of factors at work.

According to NASA , it’s the lumps that are around the size of a football field and up that make the most impact, and one of these hits us every couple of thousand of years. They can cause significant damage and leave a lasting impact. Two worth mentioning that you can visit are the aptly named “ Meteor Crater ” in Arizona, USA, and the Wolfe Creek Meteorite Crater in Western Australia. Both of these are around a kilometre in diameter, meaning you can see the whole structure with the naked eye and really get a feel for the force required to create such a hole. Of course you can also find smaller ones all over the world.

Star Gazing. You might not be able to get to the stars, but that doesn’t mean you can’t appreciate them. I always find that just lying back and staring into the vastness of space from a really dark location is a very powerful experience. You need to be somewhere far away from light pollution to get the best views of the night sky – there are dark sky preserves (and even festivals !) where you can get a great view, otherwise, head as far away from the lights as you can and just look up.

4. Giant Telescopes

How about if you can’t get into space, you try just looking at it through a really big magnifying glass and pretend you’re there? It might be as close as you can currently get to space for free, whilst also being wowed by humanities technological accomplishments. Below are four locations around the world where you can learn all about the art of looking into space. Of course, there are many more sites around the world and you can find a list of some of the major telescopes here although not all can be visited by the public.

The Very Large Array, USA. Far out in the New Mexico wilderness, the Very Large Array is one of the world’s largest and most impressive radio telescopes. Unlike an optical telescope, which look at visible light waves, a radio telescope looks at radio waves, and from that we can learn all sorts of things from how black holes are formed through to the creation of the universe itself. These radio waves require a very large telescope, which is why the VLA is actually made up of 27 dishes, which work together to capture radio waves. There’s a small visitor centre and self-guided walking trail, and there are guided tours on the first Saturday of the month. See the official website for more details.

Jodrell Bank, UK. If you’re in the UK , then a trip to Jodrell Bank is a good option for viewing impressively large radio telescopes. In fact, Jodrell Bank is home to the world’s third largest steerable radio telescope, as well as a number of other active telescopes. There’s a visitor centre where you can learn all about the telescopes, and all sorts of other space-related things.

The Very Large Telescope, Chile. Way up high in the mountains of Chile is the world’s most advanced visible-light astronomical observatory – the aptly named “ Very Large Telescope ”. Operated by the European Southern Observatory, this is the most impressive optical instrument in the world to date, consisting of four main mirrors that are over eight meters in diameter, as well as four 1.8m diameter mirrors. These work together to create a final image, and the telescope is powerful enough that it would be able to make out a cars headlights on the moon. It’s fairly remote, what with it being on a mountain top in Chile, but you can visit – check here for more information on tours.

Green Bank Observatory, USA – At time of writing, Green Bank Observatory is home to the worlds largest steerable radio telescope, the Green Bank Telescope. Constructed in 2001, it’s one of the newest US telescopes, and with a total collecting area of 2.3 acres, is certainly impressive to behold. You can take a tour of the observatory, and there are also weekly and monthly events at the site.

5. Extra-terrestrial spots

If you’re really desperate to get off planet, you might want to frequent a location which has a history of extra-terrestrial activity such as UFO sightings. Whilst E.T. is yet to make formal contact, who knows, you might get lucky and have the chance to hop on a passing spaceship!

  Roswell, USA. If you want to learn about aliens, then the town of Roswell in New Mexico has definitely got to be on your list. It became famous as the alleged site of a huge government cover-up of a supposed alien spaceship crash at a nearby ranch property, and the town has since embraced it’s position as the world’s most famous UFO hotspot. There are a number of alien themed attractions here – we’d recommend visiting the Roswell UFO museum as a good starting point.

El Enladrillado, Chile. Central Chile is well known as a UFO spotting hotzone. So much so in fact, that the country’s national tourism board established a UFO trail, a 30km long designated trail in the Andes mountains that centres around the town of San Clemente. This is definitely a good place to come to spot UFO’s, although the national tourism authority is keen to stress that a sighting isn’t guaranteed.

Nullabor Plain, Australia. When I was travelling in Australia, I had a memorable evening out in the outback on the vast Nullabor Plain with a chap who was convinced he was regularly visited by aliens. He might have been on to something of course, with this region of Australia being particularly famous for UFO sightings. And if you don’t see a UFO, fear not, the star gazing here is pretty epic too!

HR Giger Museum, Switzerland. If you prefer your aliens of the fantastical science fiction type, then a visit to the HR Giger museum in Gruyères, Switzerland, should definitely be on your list. It’s home a large collection of works by Swiss artists HR Giger, who famously created the monsters from the sci-fi classic horror movie Alien (and its sequels). Definitely one for the sci-fi fans.

Further Reading for your Space Trip

Well, that was a lot about space. Hopefully you’ve learnt a bit about your options for getting into space as a tourist, as well as some slightly more cost-effective ways to get your space fix on! Here are a few resources that you might find useful.

• Our favourite sights along the New Mexico Space Trail , USA. Plus a guide to attending the Albuquerque International Balloon Fiesta if you’re in New Mexico.
• Our guide to visiting Jasper National Park for their annual Dark Sky Festival
• A guide to attending Space Camp USA , as well as visiting the U.S Space and Rocket Center
• Official websites for Virgin Galactic , Blue Origin and SpaceX , for when you’ve saved up enough for that ticket to space
• The NASA Instagram feed , for mind blowing space images
• John Glenn’s memoir, to give you an insight into what it was like to be the first American to orbit the earth.
• Chris Hadfield’s book “ An Astronaut’s Guide to Life on Earth ”, helping you understand how to make the impossible a reality, which seems like a good place to end this post!

Well, that was a lot to write about space travel and space tourism! We’re not quite there yet, but with the pace of developments I see no reason why, in the coming years and decades, that I won’t finally be able to realise my dream of heading up into space for real. Let me know in the comments if heading into space is a dream of yours!

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Lynn Magnuson says

17th February 2024 at 8:16 am

Traveling into space is something I’ve wanted to do ever since I was a child. I remember sitting in class and I think it was the third grade and watching Alan Shepard blast off. I knew at that point that someday I wanted to do the same thing. It hasn’t happened yet, but as time goes by the chance to do so, becomes more and more a possibility. I hope someday I do get the chance.

I love your article. Very well written and very informative. Keep up the great writing. That’s another thing I share a passion for. Writing

Laurence Norah says

20th February 2024 at 1:45 am

I’m right there with you! I really hope you get the chance to get into space some day soon. It’s definitely getting closer as a possibility 🙂

Safe travels, be they earthbound or not!

roshmand says

2nd July 2023 at 6:57 pm

amazing poat. thanks

4th July 2023 at 9:39 am

thank you very much 🙂

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Want to go to space? Here's how you can

Have you ever wanted to travel into space? It's theoretically possible. Here are the various options, and how much it will cost you.

Ezzy Pearson

Have you ever wanted to go to space? Is it your dream to leave Earth behind and travel the cosmos? These days getting to space is becoming more of a reality for non-astronauts, even if the cost of doing so remains astronomical.

Go back 60 years and the idea of anyone going into space was little more than a dream. Today, more than 550 people have achieved this ambition, journeying beyond our planet and into low Earth orbit.

For decades it’s been governments footing the bill for training and flying astronauts, but that could all be about to change as space tourism becomes more of a reality over the coming years.

Private spaceflight is on the verge of being able to regularly carry private passengers into space, allowing anyone who wants to travel to the stars to do so – provided they have the money, that is.

What companies are sending tourists to space?

The private company closest to sending people into space is SpaceX. In fact, it has already done so, having completed the first successful crewed flight of the Crew Dragon modules in August.

Rival Boeing isn’t far behind and hopes to have its own Starliner spacecraft certified for human spaceflight by the end of 2021.

Both companies are remaining tight-lipped about their fees, but a 2015 NASA estimate put the cost of a round trip ticket to the International Space Station (ISS) on a Crew Dragon or Starliner module at around $58 million.

Though both companies built the spacecraft to ferry astronauts to and from the ISS, they also plan on selling flights to whoever can afford it, be they academic institutions hoping to conduct research in orbit or deep-pocketed individuals wanting to take the ultimate trip.

Getting into space: your options

Visit the international space station.

NASA is already anticipating the coming boom of private passengers, announcing back in March that the American space manufacturer Axiom would be building an ISS module to accommodate them.

Axiom is also helping to facilitate flights to the station. Their first, which will take 3 private astronauts to the International Space Station , is planned for mid 2021. There’s still a seat going spare but you’ll have to pay the $55 million price tag on the ticket.

If your budget can stretch to the billions rather than the millions, however, you can always approach private space exploration companies direct for something a little more bespoke than an off-the-shelf flight.

Take a trip around the Moon

Space X is currently working with Japanese billionaire Yusaku Maezawa on such a mission, called #dearmoon , which will send 6 to 8 passengers on a flight around the Moon.

Maezawa is even giving away his seats, but you’ll have to be a world-class artist to stand a chance of getting one; his plan is for all the passengers to create works of art attempting to convey the experience of being in space to the world.

Reach 'outer space' with Virgin Galactic

At the other end of the fee scale, relatively speaking, is the option of taking a sub-orbital flight with Virgin Galactic .

The company promises passengers three things: to cross the boundary into outer space 100km above Earth’s surface; to let them see the curvature of Earth; and at least 5 minutes of free-floating weightlessness.

After years of postponements, founder Richard Branson has announced that he hopes to take his own first flight in early 2021, before working down the list of 600 people who have purchased a ticket at the early-bird price of $250,000.

Become an astronaut

While it’s nice to daydream, the reality is that most of us could never afford even the 6-figure option. There is one more possibility, however: become a professional astronaut.

All you need is excellent physical health; a masters in a physical science, engineering or medicine; several years of work experience; a decorated military history; or over 1,000 hours of flight experience. Easy, eh?

If you’re applying to NASA, who select around a dozen candidates every few years, then you’ll need to have US citizenship. For more on this, read the guide to becoming a NASA astronaut .

For Europeans there might be a bit more of a fight, as the European Space Agency (ESA) hasn’t selected a new class of astronauts since 2008, when 8,414 people applied for just 6 places.

Rumour has it that the agency will be sending out a call for new astronauts in 2021, so it might be time to start working on the CV.For more on this, read the ESA guide to becoming an astronaut .

Which non-astronauts have been to space?

In 1984, American citizen Charles D Walker became the first non-government sponsored person to reach space.His employer, aerospace company McDonnell Douglas, paid for him to fly on three Shuttle missions.

NASA charged just $40,000 per flight, though the company spent around $20 million of its own money training him.

Most private spaceflights, however, were not flown on NASA's Space Shuttle but on the Russian Soyuz .

In the 1990s, the Soviet Union’s wider financial problems left its space agency with a shortfall in its ledger, making it more than willing to accommodate paying customers.

In 1990, a Japanese broadcasting company paid for reporter Toyohiro Akiyama to fly to the Mir space station, and a few years later Helen Sharman had her flight paid for by various sponsors, becoming the UK’s first astronaut.

In 1998, Space Adventures began working with the Russian space agency to broker future flights to the International Space Station (ISS).

Since then, the company has trained and flown seven individuals, including the second person to wear the British flag in space, gaming entrepreneur Richard Garriott.

In all these flights, the individuals did more than just float around, looking at the view.Instead, they helped to conduct research and experiments, or put on outreach events to educate those back on Earth.

Ezzy Pearson is BBC Sky at Night Magazine's News Editor. This guide originally appeared in the November 2020 issue of BBC Sky at Night Magazine .

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Astronauts spend years training for missions. How do commercial travelers get ready?

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The Medical School’s Aleksandra Stankovic is an aerospace psychologist and spaceflight biomedical researcher who studies how to optimize human performance and behavioral health in extreme operational environments. We asked her how a person gets ready to travel to space.

The spaceflight environment presents many challenges — technical, physical, and psychological. With more people having access to space travel today than ever before, successful and safe spaceflights require varying levels of preparation before launch day.

For government astronauts, candidates undergo a rigorous two-year initial training period before qualifying for flight assignment. This training includes learning about Space Station and flight vehicle systems, studying orbital mechanics, becoming proficient in emergency procedures (like how to handle scenarios such as fire, cabin depressurization, or medical issues), conducting flight training in T-38 jets (to build quick decision-making skills in high-performance aircraft), and developing Russian language skills (since international space missions involve collaboration among astronauts from various countries).

To prepare for the microgravity environment of space, astronauts also participate in simulations of weightlessness, including parabolic flights and training in the Neutral Buoyancy Lab, a large swimming pool where astronauts practice conducting spacewalks and learn to perform tasks in their pressurized spacesuits. Astronauts complete survival training and learn to cope with extreme conditions — a crucial skill in case of an emergency landing back on Earth in the water or in very cold locations like Siberia. They are trained to operate the robotic arm that is used for tasks such as capturing cargo spacecraft.

Once they receive a flight assignment, astronauts complete an additional 18 months of mission-specific training. They simulate various mission scenarios — including launch, rendezvous, and docking — and emergency procedures. Additionally, they undergo extensive training on the scientific experiments they’ll be conducting, like how to work with equipment, collect samples, and handle data.

Anyone who spends prolonged periods in space will need to spend a lot of their day working out to keep their bodies in strong shape to be healthy when they return home.

Since maintaining physical fitness is vital for astronauts to counteract the muscle and bone loss experienced in microgravity, they spend a lot of time preflight working out. At the same time, long-duration space missions can be mentally challenging, given the prolonged isolation, confinement, and separation from family and friends. Astronauts learn strategies to manage stress, maintain psychological well-being, and work effectively in close environments with their fellow crewmembers.

Commercial astronaut training is significantly less intensive than the training government-sponsored astronauts receive, since their missions are often of shorter duration and focus more on providing safe and enjoyable flying experiences. While commercial crews may stay in space for shorter intervals ranging from a few minutes for suborbital flight to several days or even weeks on the Space Station, government astronauts typically spend six months or more on the station. (Astronaut Frank Rubio recently set the record for longest American space mission with 371 consecutive days in space; cosmonaut Valeri Polyakov, who logged 437 continuous days in orbit on Russia’s Mir space station between 1994 and 1995, still holds the world record.)

Commercial astronauts often receive more generalized training that covers the basics of space travel and safety/emergency procedures. Anyone who spends prolonged periods in space will need to spend a lot of their day working out to keep their bodies in strong shape to be healthy when they return home. Everyday activities can be challenging without gravity, and sleeping can be difficult without the normal light cues from the sun that our bodies rely upon on Earth to regulate our circadian rhythms. A combination of technology and training help space travelers adapt.

As more people travel to space, on an expanding range of flight vehicles and for varying types of missions, spaceflight preparation too will undoubtedly continue to evolve. It’s an exciting time to be studying how to keep humans safe and healthy in space, and researchers like me are thrilled to be a part of enabling this next great wave of human space exploration!

— As told to Anna Lamb/Harvard Staff Writer

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Here’s a Sneak Peek at the Far-Out Future of Space Travel

From Star Trek–like medical scanners to concepts for off-planet agriculture like in The Expanse , science fiction has often inspired actual research at NASA and other space agencies. This week, researchers are meeting at a virtual conference for the NASA Innovative Advanced Concepts (NIAC) program to brainstorm and investigate sci-fi-like ideas, some of which may very well shape the missions of the next 20 years.

A drone helicopter hopping about a Martian crater or a lunar rover that maps moon ice might have seemed far-fetched a decade ago, but the copter actually flew earlier this year, and the rover is in the planning stages. Now the conference organizers have solicited proposals for more exploratory projects, a few of which the agency might eventually fund. “We invest in long-term, far-out technologies, and most of them probably won’t work. The ones that do might change everything. It’s high risk, high payoff, almost like a venture capital investment portfolio,” says Jason Derleth, the NIAC program executive.

The program isn’t focused on incremental developments but instead seeks game-changing technologies, ones that are 10 times better than the state of the art, Derleth says. He likens it to the Pentagon’s Defense Advanced Research Projects Agency, which also explores extremely speculative concepts but developed the precursor to the modern internet, among other innovations.

The annual conference , which continues through Thursday, September 23, is publicly viewable on NIAC’s livestream . Some of the proposals discussed so far—such as for new ways to launch foldable space stations or astronaut habitats, or to extract resources from other worlds—revolve around the understanding that, for lengthy space voyages, you have to make the most of every rocket launch.

The next generation of space travelers will need resources for survival, for protective structures, and to fuel the journey further or return home. “This leaves us with two options: Take everything with us, like if you were going on a hiking trip in the desert. Or find new and creative ways to use whatever is already there,” says Amelia Greig, an aerospace engineer at University of Texas at El Paso, who presented at the conference on Tuesday.

To aid creative reuse of lunar resources, Greig and her colleagues propose a technology called ablative arc mining, which would slurp up water ice and the kinds of metals that could be used as building materials. “It’s like using controlled lightning bolts to mine the moon,” she said during her presentation. Her concept describes a van-sized moon crawler—named after the Jawa sandcrawlers of Star Wars —that picks a spot, and then places a ringed device that it carries on its front end parallel to the ground. Electric arcs zap across the ring, which can be made as large as a meter in diameter, ripping particles from the moon’s surface. Those particles, now charged, can then be moved and sorted by the machine’s electromagnetic fields. That way, rather than scoping just one resource, a single piece of equipment could fill one container with water, another with oxygen attached to other elements, and others with silicon, aluminum, or other metal particles.

An artistic representation of the ablative arc mining system deployed into a crater near the lunar south pole.

But, like all early concepts, it faces practical challenges that would have to be overcome: In this case, the moon’s dusty environment could cause problems by getting stuck in the machinery, which would have to be made dust-proof. To hunt for water ice, the crawlers also will have to trundle into permanently shadowed craters, which contain water at about 6 percent by mass but are extremely cold and dark. The crawlers’ electronics would have to be designed to operate in those rugged conditions and with a non-solar power source. It also would be tough for any astronaut to oversee them, though they could monitor the mining from the crater’s rim. NASA estimates that permanent lunar settlements will need around 10,000 kilograms of water per year. That would require at least 20 of these kinds of crawlers roving about, gradually collecting those supplies, unless this technology was supplemented with something else. For now, Greig just hopes to test a smaller demonstration version of the crawler in a few years.

Space mining projects have also prompted ethical questions. For example, scientists and others have raised concerns about lunar mining permanently changing the look of the moon in the night sky. But Greig points out that ablative arc mining wouldn’t look like the environmentally harmful pit mines on Earth; the mining region could be spread out, making some craters only slightly deeper. And as for sustainability issues, she says, “there’s enough water to last human settlements hundreds of years.”

Stop-motion representation of the arc mining process on the lunar surface.

As a potential launching point for moon-goers and expeditions to deep space, NASA has proposed a space station orbiting the moon called the Lunar Gateway . But Zachary Manchester, a roboticist at Carnegie Mellon University in Pittsburgh, argues that the limited size of rockets allows few options for launching large structures for a lunar station. “If you want something that’s bigger than a rocket fairing, which is at most a few meters, it has to get launched in multiple rockets and assembled in orbit, like the International Space Station . Or it has to somehow get scrunched up into that rocket and then somehow expand out,” Manchester says.

At a session Wednesday, he and Jeffrey Lipton, a mechanical engineer at the University of Washington, proposed a space station that would fit into that confined space. Then, once deployed, it would unfold autonomously, like origami, into a full-sized structure, some 150 times bigger than its folded size. Preliminary designs involve a many-jointed structure made of titanium, aluminum, or another metal.

Since future astronauts will likely be on-station for a while, it would need to rotate to generate artificial gravity to avoid the deleterious health effects of prolonged periods in zero-G. But humans are sensitive to spinning; no one wants to live on a merry-go-round. “If you try to build a rotating space habitat, the only way to do it without making people motion-sick is to spin at up to two revolutions per minute,” Manchester says. To produce Earth-like gravity, such a space station needs to be a kilometer across, he argues. Yet squishing such a massive structure into a tiny space until it’s deployed poses a significant engineering challenge. In addition, to make their idea a reality, Manchester and Lipton ultimately need to figure out how to make the unfolding process not get jammed, despite the structure’s thousands of links and joints.

An artist's illustration of the Lunar Gateway in orbit around the moon.

Like packing for the biggest road trip ever, NASA will face similar challenges when fitting everything needed for moon or Mars structures onto rockets. To lighten the load, some scientists have suggested using Martian rocks as material for 3D-printing parts of structures. (A simulated lunar regolith is currently being test-printed aboard the International Space Station.) But Lynn Rothschild, an astrobiologist at NASA Ames Research Center in Mountain View, California, has a completely different idea: making structures out of mushrooms—or “mycotecture,” as she calls it. “The humble mushroom can provide an unbelievable building material. It’s completely natural, compostable, and the ultimate green building,” Rothschild says.

Although fungi could be used to grow the material for actual bricks and mortar that astronauts could use for construction, the best kind of space habitat would be assembled before they even arrive. Her team’s proposal involves launching a lander that would include plastic scaffolding and fungal mycelia, white filaments that make the root structure of fungi. (Like yeasts, mycelia can survive for a while without being fed.) The scaffolding would be a lattice of square hollow plastic cells, stitched into layers to make the shape of the final structure. On Mars, it would inflate to perhaps the size of a garage. Using water and oxygen—at least some of which would likely have been sourced or generated on Mars—the fungi would grow along those stitches and fill the cells, eventually turning a tent-like structure into a full-fledged building.

For strength and protection from space radiation, Rothschild thinks some kind of dark fungi could do the trick. “Black fungi—they make you say ‘Blecch,’ they look kind of disgusting. But the black pigment tends to protect from radiation, protecting the fungi and the people inside the habitat,” Rothschild says. She hopes to send a prototype to the International Space Station in the next few years.

Unlike the moon, Mars was once friendly to life . So Rothschild is designing the scaffolding to prevent any chance of renegade fungi escaping beyond the astronauts’ structures. (The last thing NASA wants is for a search for life on other worlds to turn up something that actually came from Earth .) In her team’s design, the fungi are essentially “double-bagged,” with an extra layer in the plastic lattice to ensure they all stay in.

To address those issues, space agencies have “planetary protection” experts like Moogega Cooper, supervisor of the Biotechnology and Planetary Protection Group at Jet Propulsion Laboratory in Pasadena, California, who spoke at the NIAC conference. “Anywhere you are possibly interacting with liquid water that is inherent to the place, your exploring would definitely catch our attention. Where you find water you may find life,” she says. The United States is one of the original signatories of the Outer Space Treaty, which requires that every space agency or company that wants to send a mission to an alien world make sure the spacecraft and all the equipment aboard are sterilized.

While the NIAC program has a budget of just $8.5 million per year, it supports many exploratory projects. A few of the ideas presented at this week’s conference could go on to the next level, or could get picked up by other agencies or private companies, as in the case of an earlier proposal to propel a smartphone-sized spacecraft to another stellar system with lasers, which inspired Breakthrough Starshot, a privately funded enterprise. Among a few of the topics on the menu for the rest of Wednesday and Thursday: multiple presentations about moon-based radio telescopes , as well as one about personal rovers for astronauts (since Artemis astronauts will be carrying 220-pound packs) and one about planting mushrooms in space regolith to make a more Earth-like growing soil.

“All of the concepts that are awarded are pushing the edge of our understanding, and they really allow us to take science fiction and make it science fact,” Cooper says.

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3 predictions for the future of space exploration — including your own trips

Alejandra Marquez Janse

Mary Louise Kelly

Tinbete Ermyas

Peggy Whitson says more widely available space tourism is realistic. Axiom Space hide caption

Peggy Whitson says more widely available space tourism is realistic.

If you've ever traveled somewhere that left you so enthralled that you wanted to go back over and over, then you get how Peggy Whitson feels about space.

She is a seasoned astronaut who has multiple achievements under her belt: She was the first woman to command the International Space Station, and in 2017 broke the record for most cumulative days in space of any American and female astronaut, with a count of 665.

Whitson retired from NASA nearly five years ago, but last month, at age 63, she packed up the necklace she wore on her wedding day, zipped her spacesuit one more time, and took flight in a SpaceX capsule as commander of the Ax-2 mission. It was sponsored by a private company, Axiom Space, where she now works as the director of human spaceflight. Three paying crew members traveled with her.

After returning to Earth, Whitson spoke with All Things Considered host Mary Louise Kelly and shared a few thoughts about the future of space exploration.

This interview has been edited slightly for clarity and brevity.

The Ax-2 crew in a training session. The group, composed of Whitson (far left) and three paying costumers, spent nine days in space last month. Axiom Space hide caption

The Ax-2 crew in a training session. The group, composed of Whitson (far left) and three paying costumers, spent nine days in space last month.

1. Space exploration will be a mix of public and private money

If you look at even the NASA missions returning to the moon, lots of different private space companies are involved in that process. And that includes Axiom Space, for instance, who are building the spacesuits that will be used by the NASA astronauts as they step on the moon again. So it's exciting to be part of this changing philosophy of space and the efforts of commercial companies like Axiom Space. We intend to build the first commercial space station initially attached to the International Space Station, but to undock before the space station is decommissioned.

I think it's a worldwide relationship between different companies and peoples, and that's what makes it such a special time to be a part of the [Ax-2] mission, because [space exploration] is changing flavor and it's exciting because there are going to be many more opportunities in the future.

The Ax-2 crew returns to Earth. Could this be you one day? Axiom Space hide caption

2. More people will be able to go to space

Obviously some of it will take time to make it not cost-prohibitive, but the fact that we are taking those initial steps is really important now. If you look back at commercial aviation and how that occurred and the development of that process, you know, it also started off to be only a few people could be involved and then later more and more, and so now it's pretty commonplace. I like to think that we're doing some of the same steps in commercial spaceflight now.

3. The goals depend on the person — and the country — that's traveling

Well, the objective of the mission is slightly different, obviously. My personal roles and responsibilities of taking care of the crew and ensuring their safety obviously are very similar. But our objectives were, we had one private astronaut, John Shoffner, who was trying to develop science, technology, engineering and math (STEM) outreach products for educators in the future, as well as doing research. And then we had two government sponsored astronauts from Saudi Arabia – the first female Saudi Arabian to fly in space and go to the International Space Station – and the second male to arrive.

SpaceX mission returns from space station with ex-NASA astronaut, 3 paying customers

So the objectives of the crew weren't all that much different necessarily than a NASA mission, which is outreach and scientific investigations, but these were with the specific goals of expanding outreach in specific areas for Saudi – which hadn't had a person in space for 40 years – and, you know, to inspire their youth as well as inspiring the youth in the United States.

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Space Tourism Is Here: Booking a Trip to the Final Frontier

The next era of space exploration and innovation is here — and we're all invited. Space tourism is officially taking flight, and it might just save the Earth.

In July 2021, we watched as Richard Branson and Jeff Bezos took to the skies in a giant leap for the space tourism industry, but their launches to the edge of space weren't timed particularly well. Against the backdrop of a global pandemic and climate emergency, two billionaires taking joy rides to space may not have been good optics, but don't underestimate what happened — and how important it could be for the future of humanity.

With the first crewed launches of Virgin Galactic's supersonic space plane and Blue Origin's reusable rocket, a world of commercial space travel is taking its first step. Both companies plan to begin regular, scheduled trips for paying space tourists in the near future, but their visions stretch back many years to the beginning of human spaceflight.

The Space Race: Then and Now

Bezos's Blue Origin chose an auspicious day to send its first crew to space. July 20, 2021 was exactly 52 years after Apollo 11 astronauts Neil Armstrong and Buzz Aldrin became the first humans to walk on the moon. But that wasn't the only major space travel anniversary celebrated in 2021.

April 12 was the 60th anniversary of Russian cosmonaut Yuri Gagarin becoming the first human to not only reach space, but also go into orbit around Earth. Meanwhile, May 5 saw the 60th anniversary of NASA's Freedom 7 mission, which launched Alan Shepard on a suborbital flight that lasted 15 minutes. He reached an altitude of 101 miles to become the first American in space before his capsule parachuted to splashdown in the ocean.

The name of Blue Origin's New Shepard launch system is no coincidence. Its mission profile is almost identical to America's inaugural 1961 spaceflight, save for billionaire-grade comfy seats and large windows. From Launch Site One near Van Horn in the West Texas desert, that rocket fires a capsule containing up to six people (but no pilot) into space, which then parachutes down 15 minutes later.

The Virgin Galactic experience is different. Its supersonic rocket-powered spaceplane SpaceShipTwo VSS Unity seats six passengers and two highly trained pilots. It takes off on a runway from Spaceport America near Truth or Consequences, New Mexico, while strapped to a mothership. At 52,000 feet, it detaches and burns its rocket engine for one minute to reach Mach 3 speeds and touch the edge of space. After a few minutes of weightlessness (and a chance for passengers to see the curvature of Earth against the blackness of space), it glides back to land on a runway.

The Price for a Ticket to Space

These short trips cost between $250,000 and $500,000, but in April 2022, a truly out-of-this-world private trip to space launched with an even more astronomical price tag. It came from the other billionaire in the space tourism bubble: Elon Musk. Axiom Mission 1 saw his company, SpaceX, launch four private astronauts on behalf of Houston-based space tourism company Axiom Space. An American real estate investor, a Canadian investor, a former Israeli Air Force pilot, and a former NASA astronaut took an incredible orbital mission in its Crew Dragon spacecraft. 

At $55 million per ticket, the trip to the International Space Station represented ultra-aspirational space tourism of the highest order. "They [did] what real astronauts do, and I don't think it's an accident that Virgin Galactic and Blue Origin did their flights before Axiom's mission,” says Christina Korp, cofounder of  Space for a Better World . Axiom Space intends to launch a private space station — the first "space hotel" — as early as 2025 to give space tourists somewhere to visit.

The Future of Space Tourism — and of Our Planet

Musk talks of Mars colonies and humanity spreading out into the cosmos, but since 2012, SpaceX has made a lot of money from NASA contracts to launch supplies to the ISS. In the summer of 2020, it began ferrying NASA astronauts there, too. SpaceX's Starship — currently being tested — is slated to land two NASA astronauts, the first woman and the next man, on the moon as early as 2025.

You see, space tourism is just a sideshow to a bigger and more worthy goal of saving the planet. Sometime in the next few years, Blue Origin plans to test its reusable New Glenn rocket — named after John Glenn, who, in 1962, became the first American to orbit the Earth — which will be able to take cargo and astronauts into orbit. Bezos has said he thinks we need to go to space to save Earth, specifically by protecting the planet from pollution by moving heavy industry into space. That can only happen when space travel is safe, scheduled, and affordable. Space tourism will help create a competitive space economy, just as mass tourism has lowered the cost of flying.

Similarly, Branson's aim is to increase access to space. "We are at the vanguard of a new space age…Our mission is to make space more accessible to all," he said after his inaugural flight. A microgravity experiment was on board that first flight in July 2021, with similar plans for all subsequent trips.

The scientific spin-offs for all of us down on Earth are currently unknown, but the space community has an incredible track record when it comes to innovation. "Clean energy as solar power is from the space program," says Korp. "Solar panels were invented to power satellites and refined to power spacecraft." Cue GPS, weather forecasting, telecommunications, and even internet access. There are also fleets of satellites large and small that observe how our planet is behaving and changing. "It's the space industry that's monitoring climate change, tracking hurricanes, and learning how to survive in the extreme environment of space — including experiments to grow food with almost no water, for example," says Korp. Every single space mission, including suborbital and even zero-gravity flights, have environmental experiments on board as default.

"This is not about escaping Earth," said Bezos after the flight. "The whole point is, this is the only good planet in the solar system and we have to take care of it." Bezos wants to scale up into affordable space travel. That will enable long-term, commercial projects that ultimately may help prevent further climate change, or at least help us cope with its consequences.

However, Blue Origin, Virgin Galactic, and SpaceX won't be the only way to reach space. Russian space agency Roscosmos is expected to take "citizen space explorers" to the ISS soon, but the most affordable way to get "black sky time" may be with Space Perspective , which will launch a pressurized capsule propelled by a high-performance space balloon.

The six-hour flight costs $125,000 per person and is slated to launch from Space Coast Spaceport in Florida in 2024 (the first flight is already fully booked, but you can put your name on a waiting list for any future expeditions). "Unlike short-lived, adrenaline-fueled moments of weightlessness, Space Perspective flights bring you space calm," says Jane Poynter, founder, co-CEO, and CXO of Space Perspective. The flights on Spaceship Neptune involve a gentle ascent at just 12 miles per hour for a six-hour tour of Earth's biosphere, culminating in a view of our beautiful planet from space.

Space tourism is here at last. Instagram had better get ready for "Earth selfies."

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Everything you need to know about space travel (almost)

We're a long way from home...

Paul Parsons

When did we first start exploring space?

The first human-made object to go into space was a German V2 missile , launched on a test flight in 1942. Although uncrewed, it reached an altitude of 189km (117 miles).

Former Nazi rocket scientists were later recruited by both America and Russia (often at gunpoint in the latter case), where they were instrumental in developing Intercontinental Ballistic Missiles (ICBMs) – rockets capable of carrying nuclear weapons from one side of the planet to the other.

It was these super-missiles that formed the basis for the space programmes of both post-war superpowers. As it happened, Russia was the first to reach Earth orbit, when it launched the uncrewed Sputnik 1 in October 1957, followed a month later by Sputnik 2, carrying the dog Laika – the first live animal in space.

The USA sent its first uncrewed satellite, Explorer 1, into orbit soon after, in January 1958. A slew of robotic spaceflights followed, from both sides of the Atlantic, before Russian cosmonaut Yuri Gagarin piloted Vostok 1 into orbit on 12 April 1961, to become the first human being in space . And from there the space race proper began, culminating in Neil Armstrong and Buzz Aldrin becoming the first people to walk on the Moon as part of NASA's Apollo programme .

Why is space travel important?

Space exploration is the future. It satisfies the human urge to explore and to travel, and in the years and decades to come it could even provide our species with new places to call home – especially relevant now, as Earth becomes increasingly crowded .

Extending our reach into space is also necessary for the advancement of science. Space telescopes like the Hubble Space Telescope and probes to the distant worlds of the Solar System are continually updating, and occasionally revolutionising, our understanding of astronomy and physics.

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But there are also some very practical reasons, such as mining asteroids for materials that are extremely rare here on Earth.

One example is the huge reserve of the chemical isotope helium-3 thought to be locked away in the soil on the surface of the Moon . This isotope is a potential fuel for future nuclear fusion reactors – power stations that tap into the same source of energy as the Sun. Unlike other fusion fuels, helium-3 gives off no hard-to-contain and deadly neutron radiation.

However, for this to happen the first challenge to overcome is how to build a base on the Moon. In 2019, China's Chang’e 4 mission marked the beginning of a new space race to conquer the Moon, signalling their intent to build a permanent lunar base , while the NASA Artemis mission plans to build a space station, called Lunar Orbital Platform-Gateway , providing a platform to ferry astronauts to the Moon's surface.

Could humans travel into interstellar space and how would we get there?

It’s entirely feasible that human explorers will visit the furthest reaches of our Solar System. The stars, however, are another matter. Interstellar space is so vast that it takes light – the fastest thing we know of in the Universe – years, centuries and millennia to traverse it. Faster-than-light travel may be possible one day, but is unlikely to become a reality in our lifetimes.

It’s not impossible that humans might one day cross this cosmic gulf, though it won’t be easy. The combustion-powered rocket engines of today certainly aren’t up to the job – they just don’t use fuel efficiently enough. Instead, interstellar spacecraft may create a rocket-like propulsion jet using electric and magnetic fields. This so-called ‘ ion drive ’ technology has already been tested aboard uncrewed Solar System probes.

Another possibility is to push spacecraft off towards the stars using the light from a high-powered laser . A consortium of scientists calling themselves Breakthrough Starshot is already planning to send a flotilla of tiny robotic probes to our nearest star, Proxima Centauri, using just this method.

Though whether human astronauts could survive such punishing acceleration, or the decades-long journey through deep space, remains to be seen.

How do we benefit from space exploration?

Pushing forward the frontiers of science is the stated goal of many space missions . But even the development of space travel technology itself can lead to unintended yet beneficial ‘spin-off’ technologies with some very down-to-earth applications.

Notable spin-offs from the US space programme, NASA, include memory foam mattresses, artificial hearts, and the lubricant spray WD-40. Doubtless, there are many more to come.

Read more about space exploration:

• The next giant leaps: The UK missions getting us to the Moon
• Move over, Mars: why we should look further afield for future human colonies
• Everything you need to know about the Voyager mission
• 6 out-of-this-world experiments recreating space on Earth

Space exploration also instils a sense of wonder, it reminds us that there are issues beyond our humdrum planet and its petty squabbles, and without doubt it helps to inspire each new generation of young scientists. It’s also an insurance policy. We’re now all too aware that global calamities can and do happen – for instance, climate change and the giant asteroid that smashed into the Earth 65 million years ago, leading to the total extinction of the dinosaurs .

The lesson for the human species is that we keep all our eggs in one basket at our peril. On the other hand, a healthy space programme, and the means to travel to other worlds, gives us an out.

Is space travel dangerous?

In short, yes – very. Reaching orbit means accelerating up to around 28,000kph (17,000mph, or 22 times the speed of sound ). If anything goes wrong at that speed, it’s seldom good news.

Then there’s the growing cloud of space junk to contend with in Earth's orbit – defunct satellites, discarded rocket stages and other detritus – all moving just as fast. A five-gram bolt hitting at orbital speed packs as much energy as a 200kg weight dropped from the top of an 18-storey building.

And getting to space is just the start of the danger. The principal hazard once there is cancer-producing radiation – the typical dose from one day in space is equivalent to what you’d receive over an entire year back on Earth, thanks to the planet’s atmosphere and protective magnetic field.

Add to that the icy cold airless vacuum , the need to bring all your own food and water, plus the effects of long-duration weightlessness on bone density, the brain and muscular condition – including that of the heart – and it soon becomes clear that venturing into space really isn’t for the faint-hearted.

When will space travel be available to everyone?

It’s already happening – that is, assuming your pockets are deep enough. The first self-funded ‘space tourist’ was US businessman Dennis Tito, who in 2001 spent a week aboard the International Space Station (ISS) for the cool sum of $20m (£15m).

Virgin Galactic has long been promising to take customers on short sub-orbital hops into space – where passengers get to experience rocket propulsion and several minutes of weightlessness, before gliding back to a runway landing on Earth, all for $250k (£190k). In late July 2020, the company unveiled the finished cabin in its SpaceShipTwo vehicle, suggesting that commercial spaceflights may begin shortly.

Meanwhile, Elon Musk’s SpaceX , which in May 2020 became the first private company to launch a human crew to Earth orbit aboard the Crew Dragon , plans to offer stays on the ISS for $35k (£27k) per night. SpaceX is now prototyping its huge Starship vehicle , which is designed to take 100 passengers from Earth to as far afield as Mars for around $20k (£15k) per head. Musk stated in January that he hoped to be operating 1,000 Starships by 2050.

10 Short Lessons in Space Travel by Paul Parsons is out now (£9.99, Michael O'Mara)

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The Future of Space Tourism Is Now. Well, Not Quite.

From zero-pressure balloon trips to astronaut boot camps, reservations for getting off the planet — or pretending to — are skyrocketing. The prices, however, are still out of this world.

By Debra Kamin

Ilida Alvarez has dreamed of traveling to space since she was a child. But Ms. Alvarez, a legal-mediation firm owner, is afraid of flying, and she isn’t a billionaire — two facts that she was sure, until just a few weeks ago, would keep her fantasy as out of reach as the stars. She was wrong.

Ms. Alvarez, 46, and her husband, Rafael Landestoy, recently booked a flight on a 10-person pressurized capsule that — attached to a massive helium-filled balloon — will gently float to 100,000 feet while passengers sip champagne and recline in ergonomic chairs. The reservation required a $500 deposit; the flight itself will cost $50,000 and last six to 12 hours.

“I feel like it was tailor-made for the chickens like me who don’t want to get on a rocket,” said Ms. Alvarez, whose flight, organized by a company called World View , is scheduled to depart from the Grand Canyon in 2024.

Less than a year after Jeff Bezos and Richard Branson kicked off a commercial space race by blasting into the upper atmosphere within weeks of each other last summer, the global space tourism market is skyrocketing, with dozens of companies now offering reservations for everything from zero-pressure balloon trips to astronaut boot camps and simulated zero-gravity flights. But don’t don your spacesuit just yet. While the financial services company UBS estimates the space travel market will be worth $3 billion by 2030, the Federal Aviation Administration has yet to approve most out-of-this-world trips, and construction has not started on the first space hotel. And while access and options — not to mention launchpads — are burgeoning, space tourism remains astronomically expensive for most.

First, what counts as space travel?

Sixty miles (about 100 kilometers) above our heads lies the Kármán line, the widely accepted aeronautical boundary of the earth’s atmosphere. It’s the boundary used by the Féderátion Aéronautique Internationale, which certifies and controls global astronautical records. But many organizations in the United States, including the F.A.A. and NASA, define everything above 50 miles to be space.

Much of the attention has been focused on a trio of billionaire-led rocket companies: Mr. Bezos’ Blue Origin , whose passengers have included William Shatner; Mr. Branson’s Virgin Galactic , where tickets for a suborbital spaceflight start at $450,000; and Elon Musk’s SpaceX , which in September launched an all-civilian spaceflight, with no trained astronauts on board. Mr. Branson’s inaugural Virgin Galactic flight in 2021 reached about 53 miles, while Blue Origin flies above the 62-mile mark. Both are eclipsed by SpaceX, whose rockets charge far deeper in to the cosmos, reaching more than 120 miles above Earth.

Balloons, like those operated by World View, don’t go nearly as high. But even at their maximum altitude of 18 or 19 miles, operators say they float high enough to show travelers the curvature of the planet, and give them a chance to experience the overview effect — an intense perspective shift that many astronauts say kicks in when you view Earth from above.

Now, how to get there …

Blue Origin and Virgin Galactic, which are both licensed for passenger space travel by the F.A.A., are open for ticket sales. (Blue Origin remains mum on pricing.) Both companies currently have hundreds or even thousands of earthlings on their wait lists for a whirl to the edge of space. SpaceX charges tens of millions of dollars for its further-reaching flights and is building a new facility in Texas that is currently under F.A.A. review.

Craig Curran is a major space enthusiast — he’s held a reserved seat on a Virgin Galactic flight since 2011 — and the owner of Deprez Travel in Rochester, N.Y. The travel agency has a special space travel arm, Galactic Experiences by Deprez , through which Mr. Curran sells everything from rocket launch tickets to astronaut training.

Sales in the space tourism space, Mr. Curran acknowledges, “are reasonably difficult to make,” and mostly come from peer-to-peer networking. “You can imagine that people who spend $450,000 to go to space probably operate in circles that are not the same as yours and mine,” he said.

Some of Mr. Curran’s most popular offerings include flights where you can experience the same stomach-dropping feeling of zero gravity that astronauts feel in space, which he arranges for clients via chartered, specialized Boeing 727s that are flown in parabolic arcs to mimic being in space. Operators including Zero G also offer the service; the cost is around $8,200.

You can almost count the number of completed space tourist launches on one hand — Blue Origin has had four; SpaceX, two. Virgin Galactic, meanwhile, on Thursday announced the launch of its commercial passenger service, previously scheduled for late 2022, was delayed until early 2023. Many of those on waiting lists are biding their time before blastoff by signing up for training. Axiom Space, which contracts with SpaceX, currently offers NASA-partnered training at Houston’s Johnson Space Center. Virgin Galactic, which already offers a “customized Future Astronaut Readiness program” at its Spaceport America facility in New Mexico, is also partnering with NASA to build a training program for private astronauts.

Would-be space tourists should not expect the rigor that NASA astronauts face. Training for Virgin Galactic’s three-hour trips is included in the cost of a ticket and lasts a handful of days; it includes pilot briefings and being “fitted for your bespoke Under Armour spacesuit and boots,” according to its website.

Not ready for a rocket? Balloon rides offer a less hair-raising celestial experience.

“We go to space at 12 miles an hour, which means that it’s very smooth and very gentle. You’re not rocketing away from earth,” said Jane Poynter, a co-founder and co-chief executive of Space Perspective , which is readying its own touristic balloon spaceship, Spaceship Neptune. If all goes according to plan, voyages are scheduled to begin departing from Florida in 2024, at a cost of $125,000 per person. That’s a fraction of the price tag for Blue Origin and Virgin Galactic, but still more than double the average annual salary of an American worker.

Neither Space Perspective nor World View has the required approval yet from the F.A.A. to operate flights.

Unique implications

Whether a capsule or a rocket is your transport, the travel insurance company battleface launched a civilian space insurance plan in late 2021, a direct response, said chief executive Sasha Gainullin, to an increase in space tourism interest and infrastructure. Benefits include accidental death and permanent disablement in space and are valid for spaceflights on operators like SpaceX, Blue Origin and Virgin Galactic, as well as on stratospheric balloon rides. They’ve had many inquiries, Mr. Gainullin said, but no purchases just yet.

“Right now it’s such high-net-worth individuals who are traveling to space, so they probably don’t need insurance,” he said. “But for quote-unquote regular travelers, I think we’ll see some takeups soon.”

And as the industry grows, so perhaps will space travel’s impact on the environment. Not only do rocket launches have immense carbon footprints, even some stratospheric balloon flights have potentially significant implications: World View’s balloons are powered by thousands of cubic meters of helium, which is a limited resource . But Ted Parson, a professor of environmental law at the University of California, Los Angeles, said that space travel’s environmental impact is still dwarfed by civil aviation. And because space travel is ultra-niche, he believes it’s likely to stay that way.

“Despite extensive projections, space tourism is likely to remain a tiny fraction of commercial space exploration,” he said. “It reminds me of tourism on Mt. Everest. It’s the indulgence of very rich people seeking a transcendent, once-in-a-lifetime experience, and the local environmental burden is intense.”

Stay a while?

In the future, space enthusiasts insist, travelers won’t be traveling to space just for the ride. They’ll want to stay a while. Orbital Assembly Corporation, a manufacturing company whose goal is to colonize space, is currently building the world’s first space hotels — two ring-shaped properties that will orbit Earth, called Pioneer Station and Voyager Station. The company, quite optimistically, projects an opening date of 2025 for Pioneer Station, with a capacity of 28 guests. The design for the larger Voyager Station , which they say will open in 2027, promises villas and suites, as well as a gym, restaurant and bar. Both provide the ultimate luxury: simulated gravity. Axiom Space , a space infrastructure company, is currently building the world’s first private space station; plans include Philippe Starck-designed accommodations for travelers to spend the night.

Joshua Bush, chief executive of travel agency Avenue Two Travel , has sold a handful of seats on upcoming Virgin Galactic flights to customers. The market for space travel (and the sky-high prices that come with it), he believes, will evolve much like civilian air travel did.

“In the beginning of the 20th century, only very affluent people could afford to fly,” he said. “Just as we have Spirit and Southwest Airlines today, there will be some sort of equivalent of that in space travel, too. Hopefully within my lifetime.”

52 Places for a Changed World

The 2022 list highlights places around the globe where travelers can be part of the solution.

Follow New York Times Travel on Instagram , Twitter and Facebook . And sign up for our weekly Travel Dispatch newsletter to receive expert tips on traveling smarter and inspiration for your next vacation. Dreaming up a future getaway or just armchair traveling? Check out our 52 Places for a Changed World for 2022.

What’s Up in Space and Astronomy

Keep track of things going on in our solar system and all around the universe..

Never miss an eclipse, a meteor shower, a rocket launch or any other 2024 event  that’s out of this world with  our space and astronomy calendar .

A speeding star is traveling through the Milky Way at around a million miles an hour. It could be moving fast enough to break free from the gravitational clutches of the galaxy .

In 1924, a radio receiver built for the battlefields of World War I tested the idea that humans were not alone in the solar system, heralding a century of searches for extraterrestrial life .

A study adds strong evidence to the hypothesis that the asteroid that killed the dinosaurs  came from a family of objects that originally formed well beyond the orbit of the planet Jupiter.

Is Pluto a planet? And what is a planet, anyway? Test your knowledge here .

Space Tourism: Can A Civilian Go To Space?

2021 has been a busy year for private space tourism: overall, more than 15 civilians took a trip to space during this year. In this article, you will learn more about the space tourism industry, its history, and the companies that are most likely to make you a space tourist.

What is space tourism?

Brief history of space tourism, space tourism companies, orbital and suborbital space flights, how much does it cost for a person to go to space, is space tourism worth it, can i become a space tourist, why is space tourism bad for the environment.

Space tourism is human space travel for recreational or leisure purposes . It’s divided into different types, including orbital, suborbital, and lunar space tourism.

However, there are broader definitions for space tourism. According to the Space Tourism Guide , space tourism is a commercial activity related to space that includes going to space as a tourist, watching a rocket launch, going stargazing, or traveling to a space-focused destination.

The first space tourist was Dennis Tito, an American multimillionaire, who spent nearly eight days onboard the International Space Station in April 2001. This trip cost him $20 million and made Tito the first private citizen who purchased his space ticket. Over the next eight years, six more private citizens followed Tito to the International Space Station to become space tourists.

As space tourism became a real thing, dozens of companies entered this industry hoping to capitalize on renewed public interest in space, including Blue Origin in 2000 and Virgin Galactic in 2004. In the 2000s, space tourists were limited to launches aboard Russian Soyuz aircraft and only could go to the ISS. However, everything changed when the other players started to grow up on the market. There are now a variety of destinations and companies for travels to space.

There are now six major space companies that are arranging or planning to arrange touristic flights to space:

• Virgin Galactic;
• Blue Origin;
• Axiom Space;
• Space Perspective.

While the first two are focused on suborbital flights, Axiom and Boeing are working on orbital missions. SpaceX, in its turn, is prioritizing lunar tourism in the future. For now, Elon Musk’s company has allowed its Crew Dragon spacecraft to be chartered for orbital flights, as it happened with the Inspiration4 3-day mission . Space Perspective is developing a different balloon-based system to carry customers to the stratosphere and is planning to start its commercial flights in 2024.

Orbital and suborbital flights are very different. Taking an orbital flight means staying in orbit; in other words, going around the planet continually at a very high speed to not fall back to the Earth. Such a trip takes several days, even a week or more. A suborbital flight in its turn is more like a space hop — you blast off, make a huge arc, and eventually fall back to the Earth, never making it into orbit. A flight duration, in this case, ranges from 2 to 3 hours.

Here is an example: a spaceflight takes you to an altitude of 100 km above the Earth. To enter into orbit — make an orbital flight — you would have to gain a speed of about 28,000 km per hour (17,400 mph) or more. But to reach the given altitude and fall back to the Earth — make a suborbital flight — you would have to fly at only 6,000 km per hour (3,700 mph). This flight takes less energy, less fuel; therefore, it is less expensive.

• Virgin Galactic: $250,000 for a 2-hour suborbital flight at an altitude of 80 km;
• Blue Origin: approximately $300,000 for 12 minutes suborbital flight at an altitude of 100 km;
• Axiom Space: $55 million for a 10-day orbital flight;
• Space Perspective: $125,000 for a 6-hour flight to the edge of space (32 km above the Earth).

The price depends, but remember that suborbital space flights are always cheaper.

What exactly do you expect from a journey to space? Besides the awesome impressions, here is what you can experience during such a trip:

• Weightlessness . Keep in mind that during a suborbital flight you’ll get only a couple of minutes in weightlessness, but it will be truly fascinating .
• Space sickness . The symptoms include cold sweating, malaise, loss of appetite, nausea, fatigue, and vomiting. Even experienced astronauts are not immune from it!
• G-force . 1G is the acceleration we feel due to the force of gravity; a usual g-force astronauts experience during a rocket launch is around 3gs. To understand how a g-force influences people , watch this video.

For now, the most significant barrier for space tourism is price. But air travel was also once expensive; a one-way ticket cost more than half the price of a new car . Most likely, the price for space travel will reduce overtime as well. For now, you need to be either quite wealthy or win in a competition, as did Sian Proctor, a member of Inspiration4 mission . But before spending thousands of dollars on space travel, here is one more fact you might want to consider.

Rocket launches are harmful to the environment in general. During the burning of rocket fuels, rocket engines release harmful gases and soot particles (also known as black carbon) into the upper atmosphere, resulting in ozone depletion. Think about this: in 2018 black-carbon-producing rockets emitted about the same amount of black carbon as the global aviation industry emits annually.

However, not all space companies use black carbon for fuel. Blue Origin’s New Shepard rocket has a liquid hydrogen-fuelled engine: hydrogen doesn’t emit carbon but simply turns into water vapor when burning.

The main reason why space tourism could be harmful to the environment is its potential popularity. With the rising amount of rocket launches the carbon footprint will only increase — Virgin Galactic alone aims to launch 400 of these flights annually. Meanwhile, the soot released by 1,000 space tourism flights could warm Antarctica by nearly 1°C !

Would you want to become a space tourist? Let us know your opinion on social media and share the article with your friends, if you enjoyed it! Also, the Best Mobile App Awards 2021 is going on right now, and we would very much appreciate it if you would vote for our Sky Tonight app . Simply tap "Vote for this app" in the upper part of the screen. No registration is required!

clock This article was published more than  1 year ago

How to travel to space, Earth’s hottest new destination

Go boldly, but pack lightly.

The space just above our planet is booming . Off-world trips are rapidly increasing: 42 of the 51 commercial astronauts recognized by the Federal Aviation Administration left Earth within the past two years.

The FAA predicts their ranks will balloon in the next decade — which may also bring new destinations, such as a rotating space hotel whose construction, planners claim, will begin in 2026 — and some experts have expressed optimism that relatively affordable space travel could be possible by the middle of this century.

For now, though, costs remain enormous. A $450,000 ticket reserves a spot on Virgin Galactic’s space plane, which flies 50 miles above Earth — six times a passenger plane’s cruising altitude. Expect to pay even more to go higher. Blue Origin’s 11-minute journey by rocket, which reportedly cost more than $1 million, shoots above the 62-miles-high Kármán line, the generally agreed-upon boundary between Earth and space. Others spend days in space. In September 2021, four civilian Americans orbited for three days aboard a SpaceX Dragon capsule. No word on how much it cost them.

For $55 million , Axiom Space will send astronauts via a SpaceX rocket to the International Space Station, a laboratory that circles Earth once every 90 minutes. For two weeks last April, the ISS’s first Axiom crew members worked in the lab while forgoing proper showers.

The New Space Age

Space “ought to be on everybody’s bucket list,” said former NASA astronaut Michael López-Alegría , the Axiom Space vice president who commanded the April mission. “We’d be the first to admit that it’s not quite democratic yet, because it’s still pretty expensive, but we’ll get there.” The Houston-based company has already begun to build a segment of what will be a private space station.

Here’s how to pack and prep for Earth’s hottest new destination.

Getting ready

Training takes days to months. Axiom Space crew members spent at least 700 hours learning new tasks: how to run experiments, dock a transport vehicle to the ISS and respond to fires.

They also practiced on a centrifuge, the rapidly spinning machine that simulates the extreme acceleration of space travel. You don’t need to be in tiptop shape — floating in microgravity is effortless, López-Alegría said — but you will have to endure intense G-force as you exit and reenter the atmosphere.

You should be mentally prepared for a unique psychological experience called the overview effect , which occurs when people witness their home planet from above. “When we came back to Earth, I could not stop crying,” said aerospace PhD student Sara Sabry, founder of the Deep Space Initiative , who traveled to space last August via Blue Origin (whose founder, Jeff Bezos, owns The Washington Post).

Aboard SpaceX, you’ll wear spacesuits: sleek, pressurized white outfits with black-visored helmets. On Virgin Galactic and Blue Origin flights, the fit is closer to a jet pilot’s, with gear that’s not designed for loss of pressure. Sabry said her suit was comfy and custom-tailored. Under Armour makes the clothes — underwear, jumpsuit and zip-up boots — for Virgin Galactic, which founder Richard Branson wore in his July 2021 journey to space’s edge.

Going boldly, packing lightly

Space may be the one place you can fly without packing an ID or passport . “When we walk onto the vehicle, we’re wearing our spacesuits and pretty much nothing else,” López-Alegría said.

Expect to leave the rest of your worldly possessions on Earth, with a few exceptions. Sabry packed three pounds of mementos in a bag, including photographs and a single dirty sock belonging to her niece. On Inspiration4, the Earth-orbiting SpaceX mission, one astronaut brought his ukulele to serenade his teammates in the capsule.

Snapping selfies

Don’t plan on filling your Instagram feed with your space travels to make your friends jealous. You won’t have your phone.

On Sabry’s Blue Origin flight, a few people had a GoPro strapped to their wrists to capture video — especially of the three minutes of weightlessness.

The ISS provides cameras to use. Astronauts can browse the internet on the space station, but posting requires help. Pictures snapped in space are beamed to Earth, López-Alegría said, where someone on the ground uploads them to social media.

Eating and drinking

There wasn’t any snacking on the Blue Origin craft, Sabry said, and the up-and-down trips don’t leave time for in-flight meals. Hot food isn’t always an option with other carriers, either. The first course served on the orbiting Dragon capsule was cold pizza, though SpaceX founder Elon Musk apologized for the unheated pie and promised future astronauts would have a food warmer.

Why NASA and other space agencies want to return to the moon

That’s how the crew heats dinner on the ISS, which boasts a varied menu: about 200 options , mostly freeze-dried or thermostabilized. Tortillas replace bread to avoid crumbs; what’s just a tabletop mess on Earth becomes a hazard when bits can float into electronics or eyeballs. There’s no soda or beer because, according to NASA, carbonation bubbles would be unpleasantly routed through the digestive system without gravity to help an astronaut burp.

Staying clean-ish

Space is like backcountry camping. Both lack laundry machines and require some hygienic compromises. When astronauts must bathe, they squeeze packets of soap and water on their skin and apply rinseless shampoo to their hair. Toilets on the ISS and Dragon Capsule collect waste via suction hoses and fans. On the space station, urine is recycled into drinkable water . Toothbrushes and paste are the same, but without sinks, there’s no spitting.

Falling asleep

You’ll roll out sleeping bags in the SpaceX spacecraft or as an Axiom crew member on the ISS. Vehicles are temperature-regulated because the outside of the ISS can swing from minus-250 in the shadows to 250 degrees in the sun. Still, some modules, or sections, of the ISS can be chillier than others: López-Alegría said he donned long underwear to be cozier when drifting off in space.

Illustrations by Elizabeth von Oehsen. Editing by Amanda Finnegan.

MIT Technology Review

• Newsletters

Would you really age more slowly on a spaceship at close to light speed?

• Neel V. Patel archive page

Every week, the readers of our space newsletter, The Airlock , send in their questions for space reporter Neel V. Patel to answer. This week: time dilation during space travel. 

I heard that time dilation affects high-speed space travel and I am wondering the magnitude of that affect. If we were to launch a round-trip flight to a nearby exoplanet—let's say 10 or 50 light-years away––how would that affect time for humans on the spaceship versus humans on Earth? When the space travelers came back, will they be much younger or older relative to people who stayed on Earth? —Serge

Time dilation is a concept that pops up in lots of sci-fi, including Orson Scott Card’s Ender’s Game , where one character ages only eight years in space while 50 years pass on Earth. This is precisely the scenario outlined in the famous thought experiment the Twin Paradox : an astronaut with an identical twin at mission control makes a journey into space on a high-speed rocket and returns home to find that the twin has aged faster.

Time dilation goes back to Einstein’s theory of special relativity, which teaches us that motion through space actually creates alterations in the flow of time. The faster you move through the three dimensions that define physical space, the more slowly you’re moving through the fourth dimension, time––at least relative to another object. Time is measured differently for the twin who moved through space and the twin who stayed on Earth. The clock in motion will tick more slowly than the clocks we’re watching on Earth. If you’re able to travel near the speed of light, the effects are much more pronounced. 

Unlike the Twin Paradox, time dilation isn’t a thought experiment or a hypothetical concept––it’s real. The 1971 Hafele-Keating experiments proved as much, when two atomic clocks were flown on planes traveling in opposite directions. The relative motion actually had a measurable impact and created a time difference between the two clocks. This has also been confirmed in other physics experiments (e.g., fast-moving muon particles take longer to decay ). 

So in your question, an astronaut returning from a space journey at “relativistic speeds” (where the effects of relativity start to manifest—generally at least one-tenth the speed of light ) would, upon return, be younger than same-age friends and family who stayed on Earth. Exactly how much younger depends on exactly how fast the spacecraft had been moving and accelerating, so it’s not something we can readily answer. But if you’re trying to reach an exoplanet 10 to 50 light-years away and still make it home before you yourself die of old age, you’d have to be moving at close to light speed. 

There’s another wrinkle here worth mentioning: time dilation as a result of gravitational effects. You might have seen Christopher Nolan’s movie Interstellar , where the close proximity of a black hole causes time on another planet to slow down tremendously (one hour on that planet is seven Earth years).

This form of time dilation is also real, and it’s because in Einstein’s theory of general relativity, gravity can bend spacetime, and therefore time itself. The closer the clock is to the source of gravitation, the slower time passes; the farther away the clock is from gravity, the faster time will pass. (We can save the details of that explanation for a future Airlock.)

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Space Travel Calculator

Table of contents

Ever since the dawn of civilization, the idea of space travel has fascinated humans! Haven't we all looked up into the night sky and dreamed about space?

With the successful return of the first all-civilian crew of SpaceX's Inspiration4 mission after orbiting the Earth for three days, the dream of space travel looks more and more realistic now.

While traveling deep into space is still something out of science fiction movies like Star Trek and Star Wars, the tremendous progress made by private space companies so far seems very promising. Someday, space travel (or even interstellar travel) might be accessible to everyone!

It's never too early to start planning for a trip of a lifetime (or several lifetimes). You can also plan your own space trip and celebrate World Space Week in your own special way!

This space travel calculator is a comprehensive tool that allows you to estimate many essential parameters in theoretical interstellar space travel . Have you ever wondered how fast we can travel in space, how much time it will take to get to the nearest star or galaxy, or how much fuel it requires? In the following article, using a relativistic rocket equation, we'll try to answer questions like "Is interstellar travel possible?" , and "Can humans travel at the speed of light?"

Explore the world of light-speed travel of (hopefully) future spaceships with our relativistic space travel calculator!

If you're interested in astrophysics, check out our other calculators. Find out the speed required to leave the surface of any planet with the escape velocity calculator or estimate the parameters of the orbital motion of planets using the orbital velocity calculator .

One small step for man, one giant leap for humanity

Although human beings have been dreaming about space travel forever, the first landmark in the history of space travel is Russia's launch of Sputnik 2 into space in November 1957. The spacecraft carried the first earthling, the Russian dog Laika , into space.

Four years later, on 12 April 1961, Soviet cosmonaut Yuri A. Gagarin became the first human in space when his spacecraft, the Vostok 1, completed one orbit of Earth.

The first American astronaut to enter space was Alan Shepard (May 1961). During the Apollo 11 mission in July 1969, Neil Armstrong and Buzz Aldrin became the first men to land on the moon. Between 1969 and 1972, a total of 12 astronauts walked the moon, marking one of the most outstanding achievements for NASA.

In recent decades, space travel technology has seen some incredible advancements. Especially with the advent of private space companies like SpaceX, Virgin Galactic, and Blue Origin, the dream of space tourism is looking more and more realistic for everyone!

However, when it comes to including women, we are yet to make great strides. So far, 566 people have traveled to space. Only 65 of them were women .

Although the first woman in space, a Soviet astronaut Valentina Tereshkova , who orbited Earth 48 times, went into orbit in June 1963. It was only in October 2019 that the first all-female spacewalk was completed by NASA astronauts Jessica Meir and Christina Koch.

Women's access to space is still far from equal, but there are signs of progress, like NASA planning to land the first woman and first person of color on the moon by 2024 with its Artemis missions. World Space Week is also celebrating the achievements and contributions of women in space this year!

In the following sections, we will explore the feasibility of space travel and its associated challenges.

How fast can we travel in space? Is interstellar travel possible?

Interstellar space is a rather empty place. Its temperature is not much more than the coldest possible temperature, i.e., an absolute zero. It equals about 3 kelvins – minus 270 °C or minus 455 °F. You can't find air there, and therefore there is no drag or friction. On the one hand, humans can't survive in such a hostile place without expensive equipment like a spacesuit or a spaceship, but on the other hand, we can make use of space conditions and its emptiness.

The main advantage of future spaceships is that, since they are moving through a vacuum, they can theoretically accelerate to infinite speeds! However, this is only possible in the classical world of relatively low speeds, where Newtonian physics can be applied. Even if it's true, let's imagine, just for a moment, that we live in a world where any speed is allowed. How long will it take to visit the Andromeda Galaxy, the nearest galaxy to the Milky Way?

We will begin our intergalactic travel with a constant acceleration of 1 g (9.81 m/s² or 32.17 ft/s²) because it ensures that the crew experiences the same comfortable gravitational field as the one on Earth. By using this space travel calculator in Newton's universe mode, you can find out that you need about 2200 years to arrive at the nearest galaxy! And, if you want to stop there, you need an additional 1000 years . Nobody lives for 3000 years! Is intergalactic travel impossible for us, then? Luckily, we have good news. We live in a world of relativistic effects, where unusual phenomena readily occur.

Can humans travel at the speed of light? – relativistic space travel

In the previous example, where we traveled to Andromeda Galaxy, the maximum velocity was almost 3000 times greater than the speed of light c = 299,792,458 m/s , or about c = 3 × 10 8 m/s using scientific notation.

However, as velocity increases, relativistic effects start to play an essential role. According to special relativity proposed by Albert Einstein, nothing can exceed the speed of light. How can it help us with interstellar space travel? Doesn't it mean we will travel at a much lower speed? Yes, it does, but there are also a few new relativistic phenomena, including time dilation and length contraction, to name a few. The former is crucial in relativistic space travel.

Time dilation is a difference of time measured by two observers, one being in motion and the second at rest (relative to each other). It is something we are not used to on Earth. Clocks in a moving spaceship tick slower than the same clocks on Earth ! Time passing in a moving spaceship T T T and equivalent time observed on Earth t t t are related by the following formula:

where γ \gamma γ is the Lorentz factor that comprises the speed of the spaceship v v v and the speed of light c c c :

where β = v / c \beta = v/c β = v / c .

For example, if γ = 10 \gamma = 10 γ = 10 ( v = 0.995 c v = 0.995c v = 0.995 c ), then every second passing on Earth corresponds to ten seconds passing in the spaceship. Inside the spacecraft, events take place 90 percent slower; the difference can be even greater for higher velocities. Note that both observers can be in motion, too. In that case, to calculate the relative relativistic velocity, you can use our velocity addition calculator .

Let's go back to our example again, but this time we're in Einstein's universe of relativistic effects trying to reach Andromeda. The time needed to get there, measured by the crew of the spaceship, equals only 15 years ! Well, this is still a long time, but it is more achievable in a practical sense. If you would like to stop at the destination, you should start decelerating halfway through. In this situation, the time passed in the spaceship will be extended by about 13 additional years .

Unfortunately, this is only a one-way journey. You can, of course, go back to Earth, but nothing will be the same. During your interstellar space travel to the Andromeda Galaxy, about 2,500,000 years have passed on Earth. It would be a completely different planet, and nobody could foresee the fate of our civilization.

A similar problem was considered in the first Planet of the Apes movie, where astronauts crash-landed back on Earth. While these astronauts had only aged by 18 months, 2000 years had passed on Earth (sorry for the spoilers, but the film is over 50 years old at this point, you should have seen it by now). How about you? Would you be able to leave everything you know and love about our galaxy forever and begin a life of space exploration?

Space travel calculator – relativistic rocket equation

Now that you know whether interstellar travel is possible and how fast we can travel in space, it's time for some formulas. In this section, you can find the "classical" and relativistic rocket equations that are included in the relativistic space travel calculator.

There could be four combinations since we want to estimate how long it takes to arrive at the destination point at full speed as well as arrive at the destination point and stop. Every set contains distance, time passing on Earth and in the spaceship (only relativity approach), expected maximum velocity and corresponding kinetic energy (on the additional parameters section), and the required fuel mass (see Intergalactic travel — fuel problem section for more information). The notation is:

• a a a — Spaceship acceleration (by default 1   g 1\rm\, g 1 g ). We assume it is positive a > 0 a > 0 a > 0 (at least until halfway) and constant.
• m m m — Spaceship mass. It is required to calculate kinetic energy (and fuel).
• d d d — Distance to the destination. Note that you can select it from the list or type in any other distance to the desired object.
• T T T — Time that passed in a spaceship, or, in other words, how much the crew has aged.
• t t t — Time that passed in a resting frame of reference, e.g., on Earth.
• v v v — Maximum velocity reached by the spaceship.
• K E \rm KE KE — Maximum kinetic energy reached by the spaceship.

The relativistic space travel calculator is dedicated to very long journeys, interstellar or even intergalactic, in which we can neglect the influence of the gravitational field, e.g., from Earth. We didn't include our closest celestial bodies, like the Moon or Mars, in the destination list because it would be pointless. For them, we need different equations that also take into consideration gravitational force.

Newton's universe — arrive at the destination at full speed

It's the simplest case because here, T T T equals t t t for any speed. To calculate the distance covered at constant acceleration during a certain time, you can use the following classical formula:

Since acceleration is constant, and we assume that the initial velocity equals zero, you can estimate the maximum velocity using this equation:

and the corresponding kinetic energy:

Newton's universe — arrive at the destination and stop

In this situation, we accelerate to the halfway point, reach maximum velocity, and then decelerate to stop at the destination point. Distance covered during the same time is, as you may expect, smaller than before:

Acceleration remains positive until we're halfway there (then it is negative – deceleration), so the maximum velocity is:

and the kinetic energy equation is the same as the previous one.

Einstein's universe — arrive at the destination at full speed

The relativistic rocket equation has to consider the effects of light-speed travel. These are not only speed limitations and time dilation but also how every length becomes shorter for a moving observer, which is a phenomenon of special relativity called length contraction. If l l l is the proper length observed in the rest frame and L L L is the length observed by a crew in a spaceship, then:

What does it mean? If a spaceship moves with the velocity of v = 0.995 c v = 0.995c v = 0.995 c , then γ = 10 \gamma = 10 γ = 10 , and the length observed by a moving object is ten times smaller than the real length. For example, the distance to the Andromeda Galaxy equals about 2,520,000 light years with Earth as the frame of reference. For a spaceship moving with v = 0.995 c v = 0.995c v = 0.995 c , it will be "only" 252,200 light years away. That's a 90 percent decrease or a 164 percent difference!

Now you probably understand why special relativity allows us to intergalactic travel. Below you can find the relativistic rocket equation for the case in which you want to arrive at the destination point at full speed (without stopping). You can find its derivation in the book by Messrs Misner, Thorne ( Co-Winner of the 2017 Nobel Prize in Physics ) and Wheller titled Gravitation , section §6.2. Hyperbolic motion. More accessible formulas are in the mathematical physicist John Baez's article The Relativistic Rocket :

• Time passed on Earth:
• Time passed in the spaceship:
• Maximum velocity:
• Relativistic kinetic energy remains the same:

The symbols sh ⁡ \sh sh , ch ⁡ \ch ch , and th ⁡ \th th are, respectively, sine, cosine, and tangent hyperbolic functions, which are analogs of the ordinary trigonometric functions. In turn, sh ⁡ − 1 \sh^{-1} sh − 1 and ch ⁡ − 1 \ch^{-1} ch − 1 are the inverse hyperbolic functions that can be expressed with natural logarithms and square roots, according to the article Inverse hyperbolic functions on Wikipedia.

Einstein's universe – arrive at destination point and stop

Most websites with relativistic rocket equations consider only arriving at the desired place at full speed. If you want to stop there, you should start decelerating at the halfway point. Below, you can find a set of equations estimating interstellar space travel parameters in the situation when you want to stop at the destination point :

Intergalactic travel – fuel problem

So, after all of these considerations, can humans travel at the speed of light, or at least at a speed close to it? Jet-rocket engines need a lot of fuel per unit of weight of the rocket. You can use our rocket equation calculator to see how much fuel you need to obtain a certain velocity (e.g., with an effective exhaust velocity of 4500 m/s).

Hopefully, future spaceships will be able to produce energy from matter-antimatter annihilation. This process releases energy from two particles that have mass (e.g., electron and positron) into photons. These photons may then be shot out at the back of the spaceship and accelerate the spaceship due to the conservation of momentum. If you want to know how much energy is contained in matter, check out our E = mc² calculator , which is about the famous Albert Einstein equation.

Now that you know the maximum amount of energy you can acquire from matter, it's time to estimate how much of it you need for intergalactic travel. Appropriate formulas are derived from the conservation of momentum and energy principles. For the relativistic case:

where e x e^x e x is an exponential function, and for classical case:

Remember that it assumes 100% efficiency! One of the promising future spaceships' power sources is the fusion of hydrogen into helium, which provides energy of 0.008 mc² . As you can see, in this reaction, efficiency equals only 0.8%.

Let's check whether the fuel mass amount is reasonable for sending a mass of 1 kg to the nearest galaxy. With a space travel calculator, you can find out that, even with 100% efficiency, you would need 5,200 tons of fuel to send only 1 kilogram of your spaceship . That's a lot!

So can humans travel at the speed of light? Right now, it seems impossible, but technology is still developing. For example, a photonic laser thruster is a good candidate since it doesn't require any matter to work, only photons. Infinity and beyond is actually within our reach!

How do I calculate the travel time to other planets?

To calculate the time it takes to travel to a specific star or galaxy using the space travel calculator, follow these steps:

• Choose the acceleration : the default mode is 1 g (gravitational field similar to Earth's).
• Enter the spaceship mass , excluding fuel.
• Select the destination : pick the star, planet, or galaxy you want to travel to from the dropdown menu.
• The distance between the Earth and your chosen stars will automatically appear. You can also input the distance in light-years directly if you select the Custom distance option in the previous dropdown.
• Define the aim : select whether you aim to " Arrive at destination and stop " or “ Arrive at destination at full speed ”.
• Pick the calculation mode : opt for either " Einstein's universe " mode for relativistic effects or " Newton's universe " for simpler calculations.
• Time passed in spaceship : estimated time experienced by the crew during the journey. (" Einstein's universe " mode)
• Time passed on Earth : estimated time elapsed on Earth during the trip. (" Einstein's universe " mode)
• Time passed : depends on the frame of reference, e.g., on Earth. (" Newton's universe " mode)
• Required fuel mass : estimated fuel quantity needed for the journey.
• Maximum velocity : maximum speed achieved by the spaceship.

How long does it take to get to space?

It takes about 8.5 minutes for a space shuttle or spacecraft to reach Earth's orbit, i.e., the limit of space where the Earth's atmosphere ends. This dividing line between the Earth's atmosphere and space is called the Kármán line . It happens so quickly because the shuttle goes from zero to around 17,500 miles per hour in those 8.5 minutes .

How fast does the space station travel?

The International Space Station travels at an average speed of 28,000 km/h or 17,500 mph . In a single day, the ISS can make several complete revolutions as it circumnavigates the globe in just 90 minutes . Placed in orbit at an altitude of 350 km , the station is visible to the naked eye, looking like a dot crossing the sky due to its very bright solar panels.

How do I reach the speed of light?

To reach the speed of light, you would have to overcome several obstacles, including:

Mass limit : traveling at the speed of light would mean traveling at 299,792,458 meters per second. But, thanks to Einstein's theory of relativity, we know that an object with non-zero mass cannot reach this speed.

Energy : accelerating to the speed of light would require infinite energy.

Effects of relativity : from the outside, time would slow down, and you would shrink.

Why can't sound travel in space?

Sound can’t travel in space because it is a mechanical wave that requires a medium to propagate — this medium can be solid, liquid, or gas. In space, there is no matter, or at least not enough for sound to propagate. The density of matter in space is of the order 1 particle per cubic centimeter . While on Earth , it's much denser at around 10 20 particles per cubic centimeter .

Dreaming of traveling into space? 🌌 Plan your interstellar travel (even to a Star Trek destination) using this calculator 👨‍🚀! Estimate how fast you can reach your destination and how much fuel you would need 🚀

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ol{padding-top:0;}.css-63uqft ul:not(:first-child),.css-63uqft ol:not(:first-child){padding-top:4px;} Spaceship and destination 👩‍🚀👨‍🚀

Spaceship acceleration

Spaceship mass

Mass of spaceship excluding fuel.

Destination

Select a destination from the list or type in distance by hand.

Which star/galaxy?

If you want to input your own distance, select the 'Custom destination' option in the 'Which star/galaxy?' field.

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Do you want to stop at destination point? If yes, the spaceship will start decelerating once it reaches the halfway point.

Calculations mode

You can compare Einstein's special relativity with non-relativistic Newton's physics. Remember that at near-light speeds only the former is correct!

Travel details 🚀

Time passed in spaceship

Time passed on Earth

Time passed in the resting frame of reference. It could be an observer on Earth.

Required fuel mass

Assuming 100% efficiency.

Maximum velocity

Note that our calculator may round velocity to the speed of light if it is really close to it.

Additional parameters

Fuel energy equivalent

Required fuel mass multiplied by c².

Maximum kinetic energy

Beta parameter for the maximum velocity.

γ [1/√(1 - β²)]

Lorentz factor for the maximum velocity.

Voyager 1: Facts about Earth's farthest spacecraft

Voyager 1 continues to explore the cosmos along with its twin probe, Voyager 2.

The Grand Tour

Voyager 1 jupiter flyby, voyager 1 visits saturn and its moons, voyager 1 enters interstellar space, voyager 1's interstellar adventures, additional resources.

Voyager 1 is the first spacecraft to travel beyond the solar system and reach interstellar space . 

The probe launched on Sept. 5, 1977 — about two weeks after its twin Voyager 2 — and as of August 2022 is approximately 14.6 billion miles (23.5 billion kilometers) away from our planet, making it Earth 's farthest spacecraft. Voyager 1 is currently zipping through space at around 38,000 mph (17 kilometers per second), according to NASA Jet Propulsion Laboratory .

When Voyager 1 launched a mission to explore the outer planets in our solar system nobody knew how important the probe would still be 45 years later The probe has remained operational long past expectations and continues to send information about its journeys back to Earth. 

Related: Celebrate 45 years of Voyager with these amazing images of our solar system (gallery)

Elizabeth Howell, Ph.D., is a staff writer in the spaceflight channel since 2022. She was contributing writer for  Space.com  for 10 years before that, since 2012. Elizabeth's on-site reporting includes two human spaceflight launches from Kazakhstan, three space shuttle missions in Florida, and embedded reporting from a simulated Mars mission in Utah. 

Size: Voyager 1's body is about the size of a subcompact car. The boom for its magnetometer instrument extends 42.7 feet (13 meters). Weight (at launch): 1,797 pounds (815 kilograms). Launch date: Sept. 5, 1977

Jupiter flyby date: March 5, 1979

Saturn flyby date: Nov. 12, 1980.

Entered interstellar space: Aug. 25, 2012. 

The spacecraft entered interstellar space in August 2012, almost 35 years after its voyage began. The discovery wasn't made official until 2013, however, when scientists had time to review the data sent back from Voyager 1.

Voyager 1 was the second of the twin spacecraft to launch, but it was the first to race by Jupiter and Saturn . The images Voyager 1 sent back have been used in schoolbooks and by many media outlets for a generation. The spacecraft also carries a special record — The Golden Record — that's designed to carry voices and music from Earth out into the cosmos. 

According to NASA Jet Propulsion Laboratory (JPL) , Voyager 1 has enough fuel to keep its instruments running until at least 2025. By then, the spacecraft will be approximately 13.8 billion miles (22.1 billion kilometers) away from the sun.  

The Voyager missions took advantage of a special alignment of the outer planets that happens just once every 176 years. This alignment allows spacecraft to gravitationally "slingshot" from one planet to the next, making the most efficient use of their limited fuel.

NASA originally planned to send two spacecraft past Jupiter, Saturn and Pluto and two other probes past Jupiter, Uranus and Neptune . Budgetary reasons forced the agency to scale back its plans, but NASA still got a lot out of the two Voyagers it launched.

Voyager 2 flew past Jupiter, Saturn, Uranus and Neptune , while Voyager 1 focused on Jupiter and Saturn.

Recognizing that the Voyagers would eventually fly to interstellar space, NASA authorized the production of two Golden Records to be placed on board the spacecraft. Sounds ranging from whale calls to the music of Chuck Berry were placed on board, as well as spoken greetings in 55 languages. 

The 12-inch-wide (30 centimeters), gold-plated copper disks also included pictorials showing how to operate them and the position of the sun among nearby pulsars (a type of fast-spinning stellar corpse known as a neutron star ), in case extraterrestrials someday stumbled onto the spacecraft and wondered where they came from.

Both spacecraft are powered by three radioisotope thermoelectric generators , devices that convert the heat released by the radioactive decay of plutonium to electricity. Both probes were outfitted with 10 scientific instruments, including a two-camera imaging system, multiple spectrometers, a magnetometer and gear that detects low-energy charged particles and high-energy cosmic rays . Mission team members have also used the Voyagers' communications system to help them study planets and moons, bringing the total number of scientific investigations on each craft to 11.

Voyager 1 almost didn't get off the ground at its launch , as its rocket came within 3.5 seconds of running out of fuel on Sept. 5, 1977.

But the probe made it safely to space and raced past its twin after launch, getting beyond the main asteroid belt between Mars and Jupiter before Voyager 2 did. Voyager 1's first pictures of Jupiter beamed back to Earth in April 1978, when the probe was 165 million miles (266 million kilometers) from home.

According to NASA , each voyager probe has about 3 million times less memory than a mobile phone and transmits data approximately 38,000 times slower than a 5g internet connection.  

To NASA's surprise, in March 1979 Voyager 1 spotted a thin ring circling the giant planet. It found two new moons as well — Thebe and Metis. Additionally, Voyager 1 sent back detailed pictures of Jupiter's big Galilean moons ( Io , Europa , Ganymede and Callisto ) as well as Amalthea .

Like the Pioneer spacecraft before it , Voyager's look at Jupiter's moons revealed them to be active worlds of their own. And Voyager 1 made some intriguing discoveries about these natural satellites. For example, Io's many volcanoes and mottled yellow-brown-orange surface showed that, like planets, moons can have active interiors.

Additionally, Voyager 1 sent back photos of Europa showing a relatively smooth surface broken up by lines, hinting at ice and maybe even an ocean underneath. (Subsequent observations and analyses have revealed that Europa likely harbors a huge subsurface ocean of liquid water, which may even be able to support Earth-like life .)

Voyager 1's closest approach to Jupiter was on March 5, 1979, when it came within 174,000 miles (280,000 km) of the turbulent cloud tops. Then it was time for the probe to aim for Saturn.

Scientists only had to wait about a year, until 1980, to get close-up pictures of Saturn. Like Jupiter, the ringed planet turned out to be full of surprises.

One of Voyager 1's targets was the F ring, a thin structure discovered only the year previously by NASA's Pioneer 11 probe. Voyager's higher-resolution camera spotted two new moons, Prometheus and Pandora, whose orbits keep the icy material in the F ring in a defined orbit. It also discovered Atlas and a new ring, the G ring, and took images of several other Saturn moons.

One puzzle for astronomers was Titan , the second-largest moon in the solar system (after Jupiter's Ganymede). Close-up pictures of Titan showed nothing but orange haze, leading to years of speculation about what it was like underneath. It wouldn't be until the mid-2000s that humanity would find out, thanks to photos snapped from beneath the haze by the European Space Agency's Huygens atmospheric probe .

The Saturn encounter marked the end of Voyager 1's primary mission. The focus then shifted to tracking the 1,590-pound (720 kg) craft as it sped toward interstellar space.

Two decades before it notched that milestone, however, Voyager 1 took one of the most iconic photos in spaceflight history. On Feb. 14, 1990, the probe turned back toward Earth and snapped an image of its home planet from 3.7 billion miles (6 billion km) away. The photo shows Earth as a tiny dot suspended in a ray of sunlight. 

Voyager 1 took dozens of other photos that day, capturing five other planets and the sun in a multi-image "solar system family portrait." But the Pale Blue Dot picture stands out, reminding us that Earth is a small outpost of life in an incomprehensibly vast universe.

Voyager 1 left the heliosphere — the giant bubble of charged particles that the sun blows around itself — in August 2012, popping free into interstellar space. The discovery was made public in a study published in the journal Science the following year.

The results came to light after a powerful solar eruption was recorded by Voyager 1's plasma wave instrument between April 9 and May 22, 2013. The eruption caused electrons near Voyager 1 to vibrate. From the oscillations, researchers discovered that Voyager 1's surroundings had a higher density than what is found just inside the heliosphere.

It seems contradictory that electron density is higher in interstellar space than it is in the sun's neighborhood. But researchers explained that, at the edge of the heliosphere, the electron density is dramatically low compared with locations near Earth. 

Researchers then backtracked through Voyager 1's data and nailed down the official departure date to Aug. 25, 2012. The date was fixed not only by the electron oscillations but also by the spacecraft's measurements of charged solar particles. 

On that fateful day — which was the same day that Apollo 11 astronaut Neil Armstrong died — the probe saw a 1,000-fold drop in these particles and a 9% increase in galactic cosmic rays that come from outside the solar system . At that point, Voyager 1 was 11.25 billion miles (18.11 billion km) from the sun, or about 121 astronomical units (AU).

One AU is the average Earth-sun distance — about 93 million miles (150 million km).

You can keep tabs on the Voyager 1's current distance and mission status on this NASA website .

Since flying into interstellar space, Voyager 1 has sent back a variety of valuable information about conditions in this zone of the universe . Its discoveries include showing that cosmic radiation out there is very intense, and demonstrating how charged particles from the sun interact with those emitted by other stars , mission project scientist Ed Stone, of the California Institute of Technology in Pasadena, told Space.com in September 2017 .

The spacecraft's capabilities continue to astound engineers. In December 2017, for example, NASA announced that Voyager 1 successfully used its backup thrusters to orient itself to "talk" with Earth . The trajectory correction maneuver (TCM) thrusters hadn't been used since November 1980, during Voyager 1's flyby of Saturn. Since then, the spacecraft had primarily used its standard attitude-control thrusters to swing the spacecraft in the right orientation to communicate with Earth. 

As the performance of the attitude-control thrusters began to deteriorate, however, NASA decided to test the TCM thrusters — an idea that could extend Voyager 1's operational life. That test ultimately succeeded. 

"With these thrusters that are still functional after 37 years without use, we will be able to extend the life of the Voyager 1 spacecraft by two to three years," Voyager project manager Suzanne Dodd, of NASA's Jet Propulsion, Laboratory (JPL) in Southern California, said in a statement in December 2017 .

Mission team members have taken other measures to extend Voyager 1's life as well. For example, they turned off the spacecraft's cameras shortly after the Pale Blue Dot photo was taken to help conserve Voyager 1's limited power supply. (The cameras wouldn't pick up much in the darkness of deep space anyway.) Over the years, the mission team has turned off five other scientific instruments as well, leaving Voyager 1 with four that are still functioning — the Cosmic Ray Subsystem, the Low-Energy Charged Particles instrument, the Magnetometer and the Plasma Wave Subsystem. (Similar measures have been taken with Voyager 2, which currently has five operational instruments .)

The Voyager spacecraft each celebrated 45 years in space in 2022, a monumental milestone for the twin probes.

"Over the last 45 years, the Voyager missions have been integral in providing this knowledge and have helped change our understanding of the sun and its influence in ways no other spacecraft can," says Nicola Fox, director of the Heliophysics Division at NASA Headquarters in Washington, in a NASA statement .

"Today, as both Voyagers explore interstellar space, they are providing humanity with observations of uncharted territory," said Linda Spilker, Voyager's deputy project scientist at JPL in the same NASA statement.

"This is the first time we've been able to directly study how a star, our Sun, interacts with the particles and magnetic fields outside our heliosphere, helping scientists understand the local neighborhood between the stars, upending some of the theories about this region, and providing key information for future missions." Spilker continues.

Voyager 1's next big encounter will take place in 40,000 years when the probe comes within 1.7 light-years of the star AC +79 3888. (The star is roughly 17.5 light-years from Earth.) However, Voyager 1's falling power supply means it will probably stop collecting scientific data around 2025.

You can learn much more about both Voyagers' design, scientific instruments and mission goals at JPL's Voyager site . NASA has lots of in-depth information about the Pale Blue Dot photo, including Carl Sagan's large role in making it happen, here . And if you're interested in the Golden Record, check out this detailed New Yorker piece by Timothy Ferris, who produced the historic artifact.  Explore the history of Voyager with this interactive timeline courtesy of NASA.  

Bibliography

• Bell, Jim. " The Interstellar Age: Inside the Forty-Year Voyager Mission ," Dutton, 2015.
• Landau, Elizabeth. "The Voyagers in popular culture," Dec. 1, 2017. https://www.nasa.gov/feature/jpl/the-voyagers-in-popular-culture
• PBS, "Voyager: A history in photos." https://www.pbs.org/the-farthest/mission/voyager-history-photos/

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Elizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. She was contributing writer for Space.com for 10 years before joining full-time. Elizabeth's reporting includes multiple exclusives with the White House and Office of the Vice-President of the United States, an exclusive conversation with aspiring space tourist (and NSYNC bassist) Lance Bass, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, flying parabolic, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, " Why Am I Taller ?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and a Bachelor of History from Canada's Athabasca University. Elizabeth is also a post-secondary instructor in communications and science at several institutions since 2015; her experience includes developing and teaching an astronomy course at Canada's Algonquin College (with Indigenous content as well) to more than 1,000 students since 2020. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: https://qoto.org/@howellspace

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NASA says astronauts stuck in space will not return on Boeing capsule, will wait for SpaceX craft

NASA will call on SpaceX to bring home two astronauts who have been stuck on the International Space Station since early June after their Boeing spacecraft ran into several problems midflight, the agency said Saturday.

The decision for astronauts Butch Wilmore and Suni Williams to hitch a ride back to Earth on a SpaceX Crew Dragon capsule, rather than on the Boeing Starliner spacecraft that they rode into orbit, puts to rest months of speculation and tension within the space agency over how — and when — the two crew members could safely return. The mission was planned to last about eight days.

“Spaceflight is risky — even at its safest and even at its most routine — and a test flight, by nature, is neither safe nor routine, and so the decision to keep Butch and Suni aboard the International Space Station and bring the Boeing Starliner home uncrewed is a result of a commitment to safety,” NASA Administrator Bill Nelson said Saturday at a news briefing.

The Starliner drama has been a major setback for Boeing's space ambitions, adding to years of struggle to get the capsule off the ground and keep up with rival company SpaceX. Even before Wilmore and Williams launched in June, the Starliner program was more than $1.5 billion over budget and years behind schedule.

Top NASA officials, including Nelson, gathered Saturday at the agency’s Johnson Space Center in Houston to conduct a formal review based on the results of tests done in orbit and on the ground .

While the agency has finally settled on how to bring the astronauts back, their return trip will not be immediate. Instead, Wilmore and Williams will remain at the space station for about six more months before flying home in February.

NASA said it will free up two seats on an upcoming SpaceX launch, known as Crew-9, that will be taking a new rotation of space station crew members to the orbiting outpost. By transporting two astronauts instead of the planned four, Wilmore and Williams will be able to fly back in the open seats at the end of the Crew-9 mission in February.

The Crew-9 flight is currently scheduled to lift off on Sept. 24 from NASA’s Kennedy Space Center in Florida.

The beleaguered Starliner capsule, meanwhile, will journey back to Earth without a crew, likely sometime in early September, according to NASA.

Boeing said in a statement following the announcement: “We continue to focus, first and foremost, on the safety of the crew and spacecraft. We are executing the mission as determined by NASA, and we are preparing the spacecraft for a safe and successful uncrewed return.”

Steve Stich, manager of NASA’s Commercial Crew Program, said that while Boeing officials expressed confidence in their spacecraft, the decision to go with SpaceX was unanimous among NASA officials.

“There was just too much uncertainty in the prediction of the thrusters,” Stich said. “If we had a model, [if] we had a way to accurately predict what the thrusters would do for the undock and all the way through the de-orbit burn, through the separation sequence, I think we would have taken a different course of action.”

NASA’s uncertainty in recent weeks stood in stark contrast to the public messaging from Boeing. The aerospace company has said that tests done in orbit and on the ground indicated that the Starliner capsule was safe to bring the astronauts home.

Over the past month, Boeing officials have not taken part in news briefings hosted by NASA to discuss the Starliner mission. Boeing was publishing details of the flight’s status on the company’s website, but there have been no mission updates posted since Aug. 2. In that statement from earlier this month , Boeing said it “remains confident in the Starliner spacecraft and its ability to return safely with crew.”

Wilmore and Williams arrived at the space station on June 6. As they were approaching the orbiting outpost, five of Starliner’s thrusters malfunctioned , causing a nearly hourlong delay in the docking process. Separately, mission managers also detected helium leaking from the capsule’s propulsion system — an issue that was known prior to the spacecraft’s launch but appeared to worsen during the flight.

Engineers from NASA and Boeing spent weeks analyzing the problems using a test engine that was built for future Starliner flights. Mission managers also conducted two “hot fire tests” in space, which involved firing the capsule’s thrusters in short bursts while it remained docked at the space station.

Wilmore and Williams launched to the International Space Station on June 5 on the first crewed flight of Boeing’s Starliner capsule. The mission, which was meant to last just over a week, was a crucial test flight for Boeing, serving as the last major step before NASA could certify the Starliner spacecraft to ferry astronauts to and from the space station on a regular basis.

It’s unclear how NASA will proceed with the certification process now, including how the space agency will evaluate Starliner’s performance on the crewed test flight.

SpaceX, meanwhile, has been ferrying NASA astronauts to and from the International Space Station since 2020.

Both Boeing and SpaceX developed their space capsules as part of NASA’s Commercial Crew Program, an initiative that started in 2011 to support private companies in building new space vehicles to take astronauts to low-Earth orbit following the retirement of the agency’s space shuttles.

Jim Free, NASA’s associate administrator, praised the teams at NASA and Boeing and said the work done over the past few months will inform future missions.

“We are a learning organization,” he said. “We’ll learn from this effort so that our crews, who are at the top of the pyramid on these missions, and their families can continue to know we’ve done that and we’ll always do our best.”

Denise Chow is a science and space reporter for NBC News.

Science | University of San Diego graduate will travel to…

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Science | University of San Diego graduate will travel to International Space Station

Jonny kim, who also was a navy seal, is scheduled to fly to the orbiting outpost next march with two russian cosmonauts..

The space agency said Kim, 40, will fly to the orbiting outpost in March along with Russian cosmonauts Sergey Ryzhikov and Alexey Zubritsky. This will be the first space mission for Kim, who will serve as a flight engineer.

Kim enlisted in the Navy after graduating from high school in 2002 and eventually became a member of SEAL Team 3, based in San Diego. He deployed twice to Iraq during the Iraq War, serving as a medic, sniper and navigator.

Kim entered USD in 2009 and earned a math degree in three years, then earned a medical degree at Harvard University. He was accepted for astronaut training in 2017 and has been assigned to Project Artemis by NASA. The project is meant to place astronauts on the moon.

Other local astronauts have fared well at NASA.

Among them are Jessica Meir and Kate Rubins, who each earned degrees from UC San Diego and served on the International Space Station. And Megan McArthur, who also earned a degree at UCSD, was an engineer on the final flight of the space shuttle program. She later served six months on the space station.

They were preceded by the late Sally Ride , who became the first American woman to travel in space. She did so aboard the space shuttle. She flew in space twice. Ride later joined the physics faculty at UCSD. One of the university’s research ships bears her name.

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Fix toilets, grow plants, call home: Stuck astronauts have 'constant to-do list'

Astronauts Barry "Butch" Wilmore and Sunita "Suni" Williams are stuck up in space for another six months after launching on a trip that was supposed to last just over a week , but they'll have plenty to keep them busy on the International Space Station.

The two veteran space travelers arrived at the space station in June aboard the Boeing Starliner, designed to shuttle people and supplies to the space station for NASA. After issues with the craft's thrusters and a helium leak, officials decided the Starliner would return to Earth without them .

Now, Wilmore and Williams are set to join the delayed SpaceX Crew-9 for its six-month rotation mission, which could start on Sept. 24. (That mission hasn't launched yet and could be delayed, too .)

The news that the astronauts will remain in space for months offers an answer to what had been an open-ended question as to when Wilmore and Williams would have their feet back on the ground. If all goes according to plan, they should be hitching a ride with Crew-9 in late February .

The pair have both ventured into space twice before and are military veterans; they know how to be adaptable and resilient, said Mike Massimino, a former NASA astronaut who has logged over 570 hours in space.

"Now they know what the new plan is, I think they're probably both embracing it as best they can," Massimino told USA TODAY. "In their career as military aviators, they've had plans change and know how to be flexible."

WHAT WENT WRONG? Boeing Starliner astronauts are 'stuck' aboard space station until February

What will the astronauts do now?

Wilmore and Williams have integrated as part of the team on board the space station, which means they're performing routine maintenance tasks and conducting science experiments daily. In the over two months since they arrived, they've done research on fluid physics, plant facility maintenance, robotic operations and observations of Earth, according to NASA.

Their experiments aim to find ways to overcome a lack of gravity to water plants: "Providing adequate water and nutrition to plants grown in space is critical as missions expand in low Earth orbit and beyond to the Moon and eventually Mars," NASA said .

Maintenance of the space station is an ongoing operation for astronauts on board, according to Terry Virts, a former NASA astronaut and commander of the space station. The station has all kinds of systems that make it possible for humans to survive in space and need repairs and maintenance: fans, air conditioners, electronic communications equipment, carbon dioxide removal systems, and the list goes on.

"There's a constant to-do list. Literally every day of your life on the space station, or almost every day, there will be some kind of maintenance. Fix the toilet or change out a fan or light bulb," Virts told USA TODAY.

Six months isn't an unusual length of time for astronauts to spend aboard the space station, so there's no worry about food or other supplies running out for them, and routine supply shipments are sent up. All things considered, it's a pretty safe place for them to be when something on a spaceship has gone wrong, Massimino said.

Astronauts' daily lives in space don't look too different than our lives on Earth, he said. Aside from the scientific research and spacewalks they might complete, astronauts usually exercise at least six days a week. They have time off their tasks on the weekends and celebrate holidays in space. They often pick up hobbies like reading or photography – and what incredible subject material to shoot .

Wilmore and Williams have snapped hundreds of photographs of Earth, including auroras and sunrises and sunsets, NASA said.

"It's a great opportunity to be able to spend all that time in space," Massimino said.

The astronauts can also remain connected to family and friends, with access to email, phone and video calls, Massimino said.

How does it feel to be 'stuck' in space?

Virts knows firsthand what it's like to get the news that he won't be returning to Earth as scheduled. In 2015, he was on board the space station when his trip was extended from a planned 169 days to 200 days after a Russian cargo spaceship lost control and burned up in the atmosphere. Before his return was rescheduled as an investigation was underway, Virts was left to wonder how long he'd be away from home.

"It was just a giant unknown," he said. "We'd all made our summer plans. I had a family, there was travel that was involved. All that stuff was set up, and it just suddenly ended."

Virts said it was hard on his family. His teenage son learned to drive while he was away in space. When he got back and had recovered from the effects of space on his body, the two went car shopping.

"There's just daily life," he said. "Basically, all astronaut spouses are single parents while those astronauts are in space. So it's not easy."

But he said Wilmore and Williams may have looked on the bright side when they first learned they weren't returning on schedule. Eight days (the length of their originally planned trip) is hardly enough time to enjoy space.

Delays are a risk of space travel

It's not the first time a space trip ended up lasting much longer than anticipated due to mechanical issues with the spacecraft .

Astronaut Frank Rubio broke the record for the longest consecutive time spent in space by an American after the capsule meant to take him back to Earth was damaged by a piece of space junk . He landed back on Earth on Sept. 27, 2023, after 371 days in orbit.

It was out of an abundance of caution that NASA and Boeing decided to bring Starliner back without Wilmore and Williams. Massimino said they're likely confident that the ship will come back safely while empty, but adding people in "raises the stakes."

Delays and issues with spacecraft, while unexpected, are one of the possibilities that all astronauts face when they set off, Virts said. It was a surprise for him when his trip home was delayed, but in the case of Wilmore and Williams, their trip was on a test flight.

"I'm sure that the two Boeing astronauts knew that this might happen," he said. "You never know. It's space travel. Things happen."

Contributing: Eric Lagatta

This article originally appeared on USA TODAY: What will stuck astronauts Butch Wilmore and Suni Williams do now?

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NASA leadership have made their decision: Starliner will be coming back to Earth -- empty. After months of data analysis and internal deliberation, NASA leadership announced on Saturday that Starliner will be coming back to Earth in September, without a crew. Meanwhile, astronauts Butch Wilmore and Sunita Williams will remain on-board the International Space Station until February 2025, when they will return on SpaceX’s Dragon spacecraft as part of the Crew-9 mission.

Starliner will return to Earth uncrewed, astronauts staying on ISS until February

Boeing’s Starliner mission is coming back to Earth — empty. After months of data analysis and internal deliberation, NASA leadership announced today that Starliner will be coming back to Earth in September, without a crew. Meanwhile, astronauts Butch Wilmore and Sunita Williams will remain on board the International Space Station until February 2025, when they will return on SpaceX's Dragon spacecraft as part of the Crew-9 mission.

Starliner astronauts will come home in February on a SpaceX Crew Dragon

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