Just as Mars - a desert planet - gives us insights into global climate change on Earth, the promise awaits for bringing back to life portions of the Red Planet through the application of Earth Science to its similar chemistry, possibly reawakening its life-bearing potential.

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

Russia perhaps is still entertaining the possibility that the moons of Mars might have access to ice or water.

It's time to open the space frontier to citizen explorers.

I shot down two airplanes in Korea, so I wasn't a slouch.

I really hate to be put in the position of trying to justify something, a decision that was made. I'm a military guy: when a decision is made, I go along with it, whatever the manufactured controversy and criticism.

Like actors and writers who are on and off again in terms of employment, I had a very unstructured life.