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" When you look at the... atmosphere on the limb of the Earth, I wouldn't say it looks unhealthy, but it definitely looks very, very fragile and just kind of like this thin film, so it looks like something that we definitely need to take care of. "

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" We do a lot of science on the space station. Over the course of the year, there'll be 400 to 500 different investigations in all different kinds of disciplines. Some are related to improving life on earth in material science, physics, combustion science, earth sciences, medicine. "

Scott Kelly

Space

Life

Earth

" Going to Mars is a bunch of baby steps, and it started off with the first human in space, Yuri Gagarin. "

" During my time in orbit, I lost bone mass, my muscles atrophied, and my blood redistributed itself in my body, which strained my heart. Every day, I was exposed to ten times the radiation of a person on Earth, which will increase my risk of a fatal cancer for the rest of my life. "

" The Earth is a beautiful planet. The space station is a great vantage point to observe it and share our planet in pictures. It makes you more of an environmentalist. "

" We're fortunate to have football on the space station. "

" The calluses on your feet in space will eventually fall off. So, the bottoms of your feet become very soft like newborn baby feet. But the top of my feet develop rough alligator skin because I use the top of my feet to get around here on space station when using foot rails. "

" The ride to orbit was impressive, as it always is. But once I got on board the space station, it really felt like I was visiting an old home; it felt very comfortable. "

" I went to the University of Maryland for a year and was considering maybe, you know, being a medical doctor but decided my other interest was maybe flying airplanes in the Navy and just kind of changed my mind and changed schools and changed majors and decided to focus a hundred percent on that. "

" I personally think going to Mars, if it takes two years or two and a half years, that's doable. Certainly, the first people who go there, that's going to be a big motivator, being first getting to Mars. "

Scott Kelly

People

Two

" I would always consider flying in space again, without a question. "

" Your arms don't hang by your side in space like they do on Earth because there is no gravity. It feels awkward to have them floating in front of me. "

" What we look for are people that are technically competent. You need a background in a scientific field, whether it's as a scientist, an engineer, medical doctor, or, you know, a person that's in the military with some kind of technical background. "

" I've flown in space four times now, so it's going to be hard in that respect, but I certainly look forward to going back to Earth. I've been up here for a really long time and sometimes, when I think about it, I feel like I've lived my whole life up here. "

" Adjusting to space is easier than adjusting to Earth for me. "

Scott Kelly

Space

Than

" When I look at the clouds over the Earth, and I know how high clouds are, I get a sense we are really, really far above those clouds. I wouldn't call it scary, but I am aware I am in space. "

" It seems like in the beginning of my flight, the space dreams were rare. And now, almost 150 days into it, the Earth dreams are more of the rare ones. "

" If you go on a journey to Mars and get into deep space, there is several hundred times, maybe 300 times the radiation. "

Scott Kelly

Journey

Deep

" The workouts have positively impacted the astronauts' bones and muscles, and they are coming back in really good shape. But some are losing bone and muscle but not as much as we saw in the early days. "

" I would say that as a government employee, I am subject to the Hatch Act. "

" We don't do laundry because that requires a lot of water, and water's at a premium up here. Plus, it'd be pretty complicated, I think, to make a space washer, although I guess you could do it. "

" Something people don't recognize is that being on the space station is probably a lot like being in some kind of confinement - like isolation. "

" The space station here is a magical place and an incredible science facility. "

" It's for us to take care of the air we breathe and the water we drink. And I do believe we have an impact on that, and we do have the ability to change it if we make the decision to. "

" It's an international space station. We have crew members from both the U.S. and Russia and now the United Kingdom with Tim Peake from the U.K... It's great to see that, on this space station, that we can work across cultures in a very cooperative way. "

" The majority of astronauts have to change their eyeglasses while in space. They bring eyeglasses with them and typically change a few months into the mission. "

" We used to have a crew of three on board the space station and even at one time a crew of two people, so it's something we can adjust to. "

" As far as the sounds on the space station, it's pumps, fans, motors, certain modules are louder than others, but it's generally a pretty nice working environment. It's not too loud or too smelly. "

" I believe in the importance of flying in space and the research that we do. "

" Just like the bones and muscles, the heart is designed to work in one gravity here on Earth, so when you put the heart in space, it operates differently and changes shape. "

" It's a combination of science, maintenance, and general housekeeping. And then, occasionally, robotics activities or a spacewalk you might get to do. "