There's a historical milestone in the fact that our Apollo 11 landing on the moon took place a mere 66 years after the Wright Brothers' first flight.

History gets reinterpreted as time goes on. Many times, the participants are lost in the retelling of the story.

I don't go through life verbalizing what I feel.

It's real easy to manufacture what you think the people want to hear. But that's not very honest.

Any observations from the Moon or a sense of realising this or that about the greater meaning of things wasn't as influential for me as the experience of coming back and dealing with being a person who's been to the Moon.

I don't think we're going to build a 50-person spacecraft or a 100-person spacecraft.

The first footfalls on Mars will mark a historic milestone, an enterprise that requires human tenacity matched with technology to anchor ourselves on another world.