Whatever I was going into, whether it was going to be chorus or history or astronomy or whatever, do it right. Be a professional. Don't just do a half baked job. Do everything correctly. Get down. Learn the details of what you're going to do.

What we're learning is that the sun and its warmth isn't the only way to get warmth in the solar system, and we've been thinking that for some time.

We need people pushing the boundaries. Exploration is what we, as humans, do.

Because exploration is not science driven, you've got to ask what is it driven by? And it's driven by politics.

We go as humans into space to expand the domain of humanity and life - not robots. And as we do, we will get more science because when you are living somewhere, you obviously learn more about it. NASA and the government must first get out of the way and then support us as we open the frontier.

People acting in their own self-interest is the fuel for all the discovery, innovation, and prosperity that powers the world.

The real difference between a man's scientific judgments about himself and the judgment of others about him is he has added sources of knowledge.

I'm friends with James Cameron. We've spent time together over the years because he is a diver and explorer and in his heart of hearts a biologist. We run into each other at scientific conferences.