The hardest thing for me as an astronaut was to improve my swimming skills..

I applied to be an astronaut four times. I was rejected three times before I was accepted. So, it's about that, not - following your dream and not gi….

I was the first person to tweet from space, but now every astronaut tweets from space and does Instagram and Snapchat and Face - they have Facebook g….

At every step of the way, when I had trouble, there were people that came in, in my life that helped me. It's important to go seek help when you need….

Astronauts cannot pick their nicknames and can only get their nicknames from other astronauts. Any astronaut who tries to give himself a cool nicknam….

My odyssey to become an astronaut kind of started in grad school, and I was working, up at MIT, in space robotics-related work; human and robot worki….

Viewing our planet was so compelling. Words like beautiful and awesome just don't do it justice. I felt that I was looking at a paradise. I was looki….

To become an astronaut is not a question of being the best at something or things coming easy to you, but it's being a person that can work with othe….

The reason we have the stars twinkle at night is because the light is being kind of blurred by the atmosphere around the Earth. That is why the Hubbl….

I think most astronauts are not risk takers. We take calculated risks for something that we think is worthwhile..