I feel we need to remind the world about the Apollo missions and that we can still do impossible things.

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.

Whenever I gaze up at the moon, I feel like I'm on a time machine. I am back to that precious pinpoint of time, standing on the foreboding - yet beautiful - Sea of Tranquility. I could see our shining blue planet Earth poised in the darkness of space.

I think the people who experienced the Apollo missions came away from that experience wondering to themselves, 'When can we get a chance to experience spaceflight?' I've heard that many, many times: that people got into a new career field hoping that they would be able to experience spaceflight.

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

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.