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Sending people into space is very important culturally. That's really the justification. You cannot rationally justify it on the basis of the science and technology we get out of it.

If we drive down the cost of transportation in space, we can do great things.

The fascination to go into space has existed for hundreds of years. But as we do things and they're successful, people get bored.

I certainly don't think I'm deserving of taking up space forever as a human. There's a whole generation of people yet to be born that are going to be so much more evolved than I am. I don't want to take up space. They're going to be better equipped to make the world a better place than I am.

Space travel for everyone is the next frontier in the human experience.

You don't go into space just for the science. Economically, it is not worth it. I think the reason we should be in space is for the exploration; it's the human endeavour.

For NASA, space is still a high priority.

Space is not an enterprise that belongs to the U.S. or to Russia or to China - it is a human endeavor and experience. And that's as it should be.

Sex in space is not just a good idea, it's survival.