The moment of twilight is simply beautiful.

I think sometime we will go to Mars and I think we'll explore it with humans sometime, but I think it's really wise to do all the robotic exploration ahead of time and learn as much as possible. Once we have learned as much as possible with the robots, then that's the time to send people, and let them then continue the research that the robots have started.

I still have my [flight] license and I can still pass a flight physical.

There are times when you devote yourself to a higher cause than personal safety.

I think that it's good for us to be able to travel in space and do research in space, and I emphasize the research, because space travel to me is far more than just seeing how far we can go.

America needs the best education system in the world. We have it in higher education. We do not have it in general education for all of our people - the K-12 education. Other nations are far, far outdoing the United States in that area. We still have the lead in research, but once again, other nations are pouring more into research also. We still have a lead, but to me it's just very, very important that we keep that lead in basic research.

On K-12 education America has gone down, down, down compared to the other nations. It doesn't mean that we have gotten dumber. It just means that we have not advanced as fast in those areas as other nations have done, and we're way down right now.