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.

There's a need for accepting responsibility - for a person's life and making choices that are not just ones for immediate short-term comfort. You need to make an investment, and the investment is in health and education.

My own American Dream was to serve my country as best I could and make a difference in America - and in the world.

As time goes by, I'm increasingly impressed by how very special and timely it was that we got the degree of national commitment needed to put people on the Moon. For the first time, this nation was united in trying to develop an interplanetary capability. We've been trying to repeat that situation ever since.

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

There should be an international lunar base. That is certainly doable.

I'm in favor of changing the destination of humans. There are a lot of manned missions that can be done, but not in the direction of the moon.