Climate has been changing for billions of years.

One of the major problems with long-term deep space human flight is the requirement for radiation shielding.

Space is not just going up and coming back down again. Space is getting into orbit and being there, living there, establishing a presence, a permanence.

Save the taxpayer's money by canceling the Ares 1 and V.

Neil Armstrong was the first man to walk on the moon. I am the first man to piss his pants on the moon.

My favourite thing to do on this planet is to scuba dive.

I was the first Navy, Marine or Air Force person who had been an astronaut to return back to the Air Force. I had certain expectations about what would be a reasonable and desirable position to be assigned to after my years of service.