We can see cities during the day and at night, and we can watch rivers dump sediment into the ocean, and see hurricanes form.

I didn't really decide that I wanted to be an astronaut for sure until the end of college.

Different astronauts sleep in different ways.

Well, we spend an awful lot of our time working and doing experiments. It's very busy up on the shuttle.

I think eventually private enterprise will be able to send people into orbit, but I suspect initially it's going to have to be with NASA's help.

On a standard space shuttle crew, two of the astronauts have a test pilot background - the commander and the pilot.

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!