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Scott Kelly Reflects On His Incredible Year In Space

His muscles are sore, his joints ache, he’s fatigued and his skin is super-sensitive, the first U.S. astronaut to spend almost a year in space told reporters Friday.

His muscles are sore, his joints ache, he's fatigued and his skin is super-sensitive, the first U.S. astronaut to spend almost a year in space told reporters Friday.

"I'm kind of surprised how I do feel different physically than the last time, with regards to muscle soreness and joint pain," Scott Kelly, 52, said during his first press conference since returning to Earth after 340 days in orbit.

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Then, there's what Kelly called "the skin issue."

"Because I hadn't touched anything for so long, (had) any significant contact, it's very, very sensitive, almost like a burning feeling wherever I sit or lie or walk," Kelly said.

Kelly and two Russian cosmonauts, including Mikhail Korneinko who was Kelly's crewmate through the year in space, landed in Kazakhstan late Tuesday.

Kelly, a veteran of three previous spaceflights, flew back to the Johnson Space Center in Houston the next day and immediately began a series of post-landing medical tests that will last about a year.

"Initially this time coming out of the capsule, I felt better than I did last time, but at some point those two lines have crossed and my level of muscle soreness and fatigue is a lot higher than it was last time," Kelly said. "That was kind of unexpected."

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NASA and its space station partners flew Kelly and Kornienko for a year as a pilot program intended to pave the way for missions to Mars lasting more than two years. Typically, crews serve aboard the space station for six months.

Kelly told reporters the year passed slowly in space, but he could have stayed longer if it was for "a good reason," such as a mission to Mars.

"It seemed like I lived there forever," Kelly said.

The daily, 250-mile-high views of the planet left Kelly with a deeper appreciation of the environment.

"You can see a lot of pollution over parts of Asia that is almost continuous, constantly there. You can't really see the ground very well. And those fires in California over the summer, that smoke was pretty extensive, covering large parts of the U.S." Kelly said.

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"But the predominant thing is you just notice how thin the atmosphere is, how fragile it looks. So that, combined with these large swabs of pollution, is somewhat alarming.

"People often say ... that we need to save the planet. The planet will be just fine. It's us that is going to have a problem ... I think the planet will eventually recover (but) it probably will be without people," Kelly said.

"For us to take care of the air we breathe and the water we drink is critical. I do believe we have an impact on that and we have the ability to change it if we make the decision to," he added.

Expedition 46 Commander Scott Kelly of NASA rest in a chair outside of the Soyuz TMA-18M spacecraft just minutes after he and Russian cosmonauts Mikhail Kornienko and Sergey Volkov of Roscosmos landed in a remote area near the town of Zhezkazgan, Kazakhstan on Wed., March 2, 2016 (Kazakh time).

Scott Kelly is a NASA astronaut working for a year in space on the International Space Station. Does he have the stuff of "The Martian,"

the highly anticipated Matt Damon movie to be released on Oct. 2

, chronicling the life of a stranded astronaut on the surface of Mars? While Kelly certainly isn't on his own in space, much of the work he is doing would be useful for a trip to Mars. Here are some of the things the astronaut is working on that Mark Watney (Damon's character in "The Martian") would appreciate.

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The sun goes through an 11-year cycle of activity, and we are just past the peak of one of those cycles. The solar peak is a time when the sun unleashes more flares and coronal mass ejections (charged particles). When these particles hit the Earth's magnetic field, they can produce spectacular auroras.

But they also can give astronauts a higher dose of radiation.

The space station monitors radiation levels for astronauts close to Earth; in fact, one of the reasons Kelly was selected for this mission was he did not exceed the lifetime radiation levels allowed for astronauts. Radiation is expected to jump for those travelling outside of Earth's magnetic influence. Mars doesn't have much magnetic field to speak of, and the Curiosity mission is monitoring radiation levels on the surface to get more information for future human missions.

MORE: Killer Radiation: How to Protect Martian Astronauts

Working in space is a harsh business. You're busy all the time, you're stuck in a small environment with several people, and your family and friends are far away. NASA keeps close tabs on its astronauts' psychological health through measures such as doctor calls with astronauts, and

having the astronauts keep journals

during their missions. This will especially be important for Mars, as astronauts will need to be even more self-sufficient due to the time delay in communications between planets. NASA has

an ongoing comm delays study

for astronauts doing simple tasks; these tasks and their effects on astronauts will be studied as the station work continues.

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Microgravity is hard on your body. NASA has its astronauts exercise for a couple of hours a day, which seems to help counteract bone loss for missions of six months. But what about a year, or longer? That's part of what Kelly's mission is supposed to answer. Bones aren't the only things to worry about, either. Muscles shrink, eye pressure increases, your sense of balance changes. Even your immune system may be affected, something that

NASA is also looking at

in detail. So while we think of astronauts as boldly doing spacewalks and experiments on station, understand that they are also part of the experiment. Their very health is being watched for the benefit of future space missions.

MORE: Space Missions Turn Astronauts' Hearts Spherical

While Watney develops a certain affection for potatoes, Kelly recently posted a picture of himself looking pretty pleased next to a floating pile of fruit. It turns out that little comforts do go a long way for astronaut morale, and any nutritionist would tell you that a varied diet of healthy foods is good for you -- not just the freeze-dried stuff the Apollo astronauts survived on during their missions. NASA has an experiment in place to see how well

astronauts are meeting nutritional requirements for their work on station

, and also for their long-term health.

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Astronauts are very tied to shipments from Earth right now in terms of eating ... but that is changing in a small way.

Thanks to an experiment called Veggie

, astronauts got to taste some food grown aboard the space station this summer. Lettuce, of course, does not an entire meal make. But as the movie Contact (1997) reminds us, it's through "small moves" that we learn about science. The hope is eventually this experiment will translate into a better way of harvesting crops beyond Earth. For Mars, we're even wondering how viable the soil could be to support plants.

MORE: 'Smart' LED Farming Could Make Space Veg Viable

"#ILookLikeAnEngineer on @space_station. Also a scientist, medical officer, farmer & at times a plumber," Kelly wrote with this image in August. What's more, he has to do all those things in a small space. Since every pound hoisted to space costs money, astronauts are accustomed to working in claustrophobic quarters. But NASA, concerned about its astronauts' efficiency and happiness, also has an

experiment that is supposed to look at how best to construct a living space for astronauts

. That way, the habitats designed for Mars will be suitable for long-term living.

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During a recent Twitter chat, Kelly was asked if he wanted to go to Mars. He said yes, as long as he could return. Getting to Mars and back will take hundreds of days of transportation, let alone the time on the surface. The gravity on Mars is less than 40% what we experience here on Earth. And unless spacecraft design changes substantially, the astronauts will be in microgravity on the way there and back. NASA has an experiment to see

how well (or badly) astronauts work on the surface shortly after landing

, an experiment that Kelly is participating in. This will be important not only for returning to Earth, but seeing how well a crew can get adapted to Mars after being in microgravity for the transit.

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