The view from space is like having a globe on your desk -- it's a broadening experience.

When the time comes to start building deep space transports and refueling rocket tankers, it will be the commercial industry that steps up, not another government-owned, government-managed enterprise.

People communicate in Twittering ways. I've learned how to do that.

The life expectancy of people going to Mars may be decreased by the higher level of radiation that they receive.

Computers allow us to squeeze the most out of everything, whether it's Google looking up things, so I guess that tends to make us a little lazy about reading books and doing things the hard way to understand how those things work.

You can tell I'm not too bashful about some of my feelings.

We need to have people up there who can communicate what it feels like, not just pilots and engineers.