Climate has been changing for billions of years.

For every winner, there's a loser. And that person didn't really need to lose. They just didn't understand the game plan.

I think we need to move to the moons of Mars and learn how to control robots that are on the surface. It's not the impatient way of getting there, but Mars has been there a long time.

Going to Mars would evolve humankind into a two-planet species.

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 realize that my life is not the common ordinary person.

I think the people who experienced the Apollo missions came away from that experience wondering to themselves, 'When can we get a chance to experience spaceflight?' I've heard that many, many times: that people got into a new career field hoping that they would be able to experience spaceflight.