That's one small step for a man, one giant leap for mankind. Words said when Armstrong first stepped onto the moon (20 July 1969).

Houston, Tranquility Base here. The Eagle has landed. First words from the Apollo 11 Lunar Landing Module Eagle after guiding the craft to a landing on the moon. It is estimated that there was 11 seconds of fuel left at touchdown. (20 July 1969)

I think we're going to the moon because it's in the nature of the human being to face challenges. It's by the nature of his deep inner soul ... we're required to do these things just as salmon swim upstream. Apollo mission press conference.

I believe that every human has a finite number of heartbeats. I don't intend to waste any of mine running around doing exercises.

Pilots take no special joy in walking. Pilots like flying.