Some astronauts describe the routine flushing of urine into space, where the freezing temperatures turn the droplets into a cloud of bright, drifting crystals, as being among the most amazing sights they saw on an entire voyage.

Another hundred years may pass before we understand the true significance of Apollo. Lunar exploration was not the equivalent of an American pyramid, some idle monument to technology, but more of a Rosetta stone, a key to unlocking dreams as yet undreamed.

We leave as we came, and, God willing, as we shall return, with peace and hope for all mankind.

Yes, I am the last man to have walked on the moon, and that's a very dubious and disappointing honor. It's been far too long.

Get the shuttle out of the garage. It's in its prime of its life. How could we just put it away?

People try to typecast astronauts as heroic and superhuman. We're only human beings.

I was a child of World War Two . I saw films of pilots taking off from aircraft carriers and decided that was the only thing I wanted to do. And it had to be flying from sea carriers. Airfields were not enough.