They didn’t tell me I was going into space until after they locked the shuttle doors and started counting down.

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

I think I need to continue to think and plan and marry all of the different things that we could do that make transportation in space from the earth to the space station, from the earth to the moon to space stations around the moon to visiting an asteroid.

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

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

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.

By refocusing our space program on Mars for America's future, we can restore the sense of wonder and adventure in space exploration that we knew in the summer of 1969. We won the moon race; now it's time for us to live and work on Mars, first on its moons and then on its surface.