Any observations from the Moon or a sense of realising this or that about the greater meaning of things wasn't as influential for me as the experience of coming back and dealing with being a person who's been to the Moon.

A space program that truly goes somewhere! With his deeds, not only words, President Obama has revitalized our struggling space program.

The energy varies with the square of the velocity, so if you need five times the velocity, that's 25 times the energy.

Unfortunately, kids are led to believe things are easier to achieve than they really are.

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

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.

There's no doubt who was a leader in space after the Apollo Program. Nobody came close to us. And our education system, in science, technology, engineering and math, was at the top of the world. It's no longer there. We're descending rather rapidly.