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

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.

Sleeping here is harder here in space than on a bed because the sleep position here is the same position throughout the day. You don't ever get that sense of gratifying relaxation here that you do on Earth after a long day at work.

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.

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

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.