Am I willing to go to Mars? Yes, but I'm not willing to spend nine months getting there, then wait 18 more months until the planets align to come home.

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.

OK, let's get this mother out of here.

Perhaps the two greatest moments of my life were standing on the moon and being outside of the room when my granddaughter was born! We tend not to remember the worst.

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.

Nobody can take those footsteps I made on the surface of the moon away from me.

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