When you're in a spacecraft, you need to know what things you can touch and what things you shouldn't touch!

Exploring Mars is a far different venture from Apollo expeditions to the moon; it necessitates leaving our home planet on lengthy missions with a constrained return capability.

Astronauts working for the government will always need to be either pilots or mission specialists. Those who want to be pilots should have military experience - ideally, a test pilot background.

It's not easy to get human beings into orbit. So far only three nations have been able to do that, with all the resources that they put together. And I'm just a little skeptical that that's going to be done by the private sector without making use of what has been done by the government.

A space program that truly goes somewhere! With his deeds, not only words, President Obama has revitalized our struggling space program.

Sending a couple of guys to the Moon and bringing them back safely? That's a stunt! That's not historic.

Pascal Lee is a true pioneer of Mars exploration.