You need propellants to accelerate toward Mars, then to decelerate at Mars, again to re-accelerate from Mars to Earth, and finally to decelerate back at Earth. Accordingly, the mass of these required propellants, in short, drives our need for innovative launch vehicles.

I'm not in favor of just taking short-term isolated situations and depleting our resources to keep our climate just the way it is today.

For the future, primarily, we must educate people in science, engineering, technology and math.

We can't start over and develop a Saturn 5-type vehicle from scratch.

Ray Bradbury is one who is contributing to the understanding of the imagination and the curiosity of the human race.

I think it's inevitable that there will be Earthlings establishing a presence on Mars. And I would say that it would certainly take place by 2050 or shortly thereafter.

What comes after the moon? I think you can guess: Mars.