You can never tell when a commercial space venture will suddenly become viable.

To move forward, what's required is a unified space agenda based on exploration, science, development, commerce, and security.

Mars has a bit of air pressure; maybe we can build up that atmosphere to be a bit more accommodating to humans.

The much-hyped Ares 1-X was much ado about nothing.

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.

The surface of the moon is like nothing here on Earth! It's totally lacking any evidence of life. It has lots of fine, talcum-powderlike dust mixed with a complete variety of pebbles, rocks, and boulders. Many pebbles, fewer rocks, and even fewer boulders naturally make up its surface. The dust is a very fine, overall dark gray. And with no air molecules to separate the dust, it clings together like cement.

Mars could very well be a staging location for the resources of the asteroid belt. We have to learn how to get a payback somewhere, but it's beyond Mars that the real payoff will come from minerals.