challenge Quotes

What are you going to do with astronauts who first reach the surface of Mars and then turn around and rocket back home-ward? What are they going to do, write their memoirs? Would they go again? Having them repeat the voyage, in my view, is dim-witted. Why don't they stay there on Mars?

Most people never believed in the real possibility of going to the moon, and neither did I until I was in my twenties.

Maybe it was the challenge of flight, the opportunity to fly, the competition of summer camp and the inspiration and discipline of West Point. I think all of those things helped me to develop a dedication and inspired me to get ahead.

Space architectures capable of supporting a permanent human presence on Mars are extraordinarily complex, with many different interdependent systems.

I do celebrity ski races all over the world.

One of the major problems with long-term deep space human flight is the requirement for radiation shielding.

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

You are not going to change the minds of people who are looking for attention.

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

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