When we can demonstrate that we can take off horizontally and put something into orbit, then we can begin to talk about increasing the amount of payload. But to say, 'I'm going to do that and put people into orbit' is a real leap.

Some things just can't be described. And stepping onto the moon was one of them.

America's can-do spirit cast a warm glow across nations and cultures, generating more goodwill and support for our country's ideals and causes than had otherwise been possible.

Timing has always been a key element in my life. I have been blessed to have been in the right place at the right time.

I felt pretty confident in relieving myself, since I had the urge.

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.

We feel that this stands as a symbol of the insatiable curiosity of all mankind to explore the unknown.