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A journey into space is the greatest adventure I can imagine.

If NASA is to reach beyond the Moon and someday reach Mars, it must be relieved of the burden of launching people and cargo to low earth orbit. To do that, we must invest more in commercial spaceflight.

Space tourism is a logical outgrowth of the adventure tourist market.

It certainly is possible to construct a moon base in such a way that crews could stay for extended periods of time.

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.

The way I see it, commercial interests should manage a lunar base while NASA gets on with the really important task of flying to Mars.

You wouldn't want to land on the Moon and launch to Mars. That would be very inefficient.

I don't go along with going to Moon first to build a launch pad to go to Mars. We should go to Mars from Earth orbit. We have already been to the Moon; we've already practiced.

The big reason why we don't have space colonies and regular trips to the moon is that flying into outer space is just plain 'hard.' The business of safely transporting people off the Earth is a costly affair that requires a lot of technology.

I'm in favor of changing the destination of humans. There are a lot of manned missions that can be done, but not in the direction of the moon.