Dark matter and dark energy are two things we measure in the universe that are making things happen, and we have no idea what the cause is.

Curiosity is missing. Curiosity in particular is something that the system, not only the educational system but, the parental... what you do as a parent at home.

I don't live life to be remembered for anything.

I love being wrong because that means in that instant, I learned something new that day.

If it's a new planet, sign me up. I'm tired of driving around the block, boldly going where hundreds have gone before in orbit around earth-give me a place to go and I'll go.

I can't think that leaving Earth once is enough.

I want to create the airplane that flies in the rarified atmosphere of Mars. This is what galvanizes a generation to want to become scientists and engineers in the first place, not we need a scientist to develop a plane that's 20 percent more fuel-efficient than the one your parents flew.