Mars is there, waiting to be reached.

We feel that this stands as a symbol of the insatiable curiosity of all mankind to explore the unknown.

It's been one of the greatest challenges that ever came along in my life; it was one of the more difficult things to do.

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

Before deciding what to do about national space policy, Obama set up an outside review panel of space experts, headed up by my friend Norm Augustine, former head of Lockheed Martin and a former government official.

If we can conquer space, we can conquer childhood hunger.

We need to begin thinking about building permanence on the Red Planet, not just have voyagers do some experiments, plant a flag and claim success. Having them go there, repeat this, in my view, is dim-witted. Why not stay there?