I think both the space shuttle program and the International Space Station program have not really lived up to their expectations.

Fear and worry are emotions that cloud the mind from being able to think clearly, to remember what the procedures are to deal with that emergency.

I don't think we're going to build a 50-person spacecraft or a 100-person spacecraft.

The universe is the way it is. It's not going to be changed by supplications.

Computers allow us to squeeze the most out of everything, whether it's Google looking up things, so I guess that tends to make us a little lazy about reading books and doing things the hard way to understand how those things work.

Having walked on the Moon, I know something about what we need to explore, really explore, in space.

Mars is there, waiting to be reached.