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.

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.

To me, money is a commodity that a person must have to function, not a goal in itself.

Is the destiny of the human species to sit back and play with our mouse and computer and imagine, fantasize?

Exploration is wired into our brains. If we can see the horizon, we want to know what's beyond.

I remember it was hard to believe that I was taking a step onto the lunar surface.

We could have human intelligence in orbit around Mars, building things there.