I poured the wine into the chalice our church had given me. In the one-sixth gravity of the moon the wine curled slowly and gracefully up the side of the cup. It was interesting to think that the very first liquid ever poured on the moon, and the first food eaten there, were communion elements.

If you want to say that the sky is black, and if I'm there, even if I fall back down again, I will be weightless for a period of time - maybe that's the definition of space.

It's been one of the greatest challenges that ever came along in my life; it was one of the more difficult things to do.

To move forward, what's required is a unified space agenda based on exploration, science, development, commerce, and security.

Climate has been changing for billions of years.

Unless we are able to commit to a permanent growing settlement [on Mars], then I don't think just going there with humans and coming back is worth doing. The expense of planning to come back is like the people who left Europe to come to America and then to turn around and go back to Europe, it really doesn't make any sense at all.

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