Anything from making a mistake on an experiment that would ruin some scientist on earth's experiment - career, potentially - to doing something wrong with the satellite that a country was depending on for its communications, to making some mistake that could actually cost you and the crew either a mission or your lives. So there is a lot of pressure that's put on every astronaut to just make sure that he or she understands exactly what to do, exactly when to do it, and is trained and prepared to carry it out.

I've spent my whole life not talking to people, and I don't see why I should start now.

I would like to be remembered as someone who was not afraid to do what she wanted to do, and as someone who took risks along the way in order to achieve her goals.

On both of my flights, everything went very well.

It's easy to sleep floating around - it's very comfortable. But you have to be careful that you don't float into somebody or something!

The view of earth is absolutely spectacular, and the feeling of looking back and seeing your planet as a planet is just an amazing feeling. It's a totally different perspective, and it makes you appreciate, actually, how fragile our existence is.

I felt very honored, and I knew that people would be watching very closely, and I felt it was very, very important that I do a good job.