When you're in a spacecraft, you need to know what things you can touch and what things you shouldn't touch!

I feel we need to remind the world about the Apollo missions and that we can still do impossible things.

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

NASA needs to focus on the things that are really important and that we do not know how to do. The agency is a pioneering force, and that is where its competitive advantage lies.

I know: If you're looking down at Earth, you're looking through an atmosphere that has a bit of haze in many places and not just occasional clouds.

There's a need for accepting responsibility - for a person's life and making choices that are not just ones for immediate short-term comfort. You need to make an investment, and the investment is in health and education.