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" A lot of the data we collect is stuff that has to be analyzed on the ground. For instance, we can't see, you know, bone loss. Our cells, you know, that's something that we'll have to notice with imaging technology when I get back. "

Scott Kelly

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Data

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

" Now, space has its own unique smell. So whenever a vehicle docks, or if guys are out doing a spacewalk, the smell of space when you open up the hatch is very distinct. It's kind of like a burning-metal smell, if you can imagine what that would smell like. "

" I don't think people have an appreciation for the work that it takes to pull these missions off, like humans living on the space station continuously for 15 years. It is a huge army of hard-working people to make it happen. "

" 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. "

" 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. "

" 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. "

" There are definitely parts of Asia, Central America that when you look at them from space, you're always looking through a haze of pollution. As far as the atmosphere is concerned, and being able to see the surface, you know, I would say definitely those areas that I mentioned look kind of sick. "

" 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. "

" We have a lot of systems here on board the space station, and we can't call a repair man when one of them breaks. "

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

" We had this incredible pass over the Himalayas, and to just see all of that pollution that's riding up against those mountains from the south is just really heartbreaking. "

" 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. "

" This is a really big space station. We do a lot of various kinds of work here, different kinds of science experiments; we have over 400 different experiments going on at any one time in different areas, from basic science research to medical technology, that hopefully will benefit more people on Earth. "

" 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. "

" When we do things that are really hard, we can achieve great things - and that has worked as a great model for me. "

Scott Kelly

Great Things

Hard

" 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. "

" 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. "

" 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 am not a great sleeper. I don't think I have ever slept 8 hours straight in the last 20 years. "

" Space has its own unique smell. So whenever a vehicle docks, or if guys are out doing a spacewalk, the smell of space when you open up the hatch is very distinct. It's kind of like a burning-metal smell, if you can imagine what that would smell like. "

" Leaving the space station was bittersweet - I had been there for a long time and looked forward to leaving, but it is a remarkable place. "

" 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

" 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. "

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

" There are parts of the Earth that are covered with pollution all the time. I saw weather that was unexpected. Storms bigger than we've seen in the past. This is a human effect. This is not a natural phenomenon. "

" We would go in there with our parents once in a while for - actually go into Manhattan for dinner, weekends occasionally to a museum, but most of my memories of traveling into Manhattan was with the school trips and then later on as we got, you know, into high school, kind of on our own and with friends. "

" There are few aspects of everyday life that aren't touched by the technologies developed for space travel. "

" It is a little bit surreal to know that you are in your own little spaceship, and a few inches from you is instant death. "

" I feel more like an environmentalist since I've been up here. There are parts of the Earth that are covered with pollution all the time. I saw weather that was unexpected. Storms bigger than we've seen in the past. This is a human effect. This is not a natural phenomenon. "

" I think anyone that's in the same building or the same place for a really long period of time, some parts of it become routine. "