There were about six years when there was not one American who went into space. We shouldn't do that again.

I was motivated to improve the U.S. strategy of going back to the moon in 1985. That's a long time ago. Going back to the moon would be a great achievement for tourism adventure flights.

I don't go through life verbalizing what I feel.

Neil Armstrong was the first man to walk on the moon. I am the first man to piss his pants on the moon.

Mars is there, waiting to be reached.

Do we really need these big, gigantic, heavy rockets? What if we launch a rocket that's empty, and its sole purpose is to act as a source of fuel on the Moon? Who should build that? Well, I think the U.S. should build that.

The society of life on Mars, or the challenge of making Mars more livable, will have significant benefits on our attempts to modify and change in some ways the environment here on Earth.