Roger, liftoff, and the clock is started.

Whether you are an astronomer or a life scientist, geophysicist, or a pilot, you've got to be there because you believe you are good in your field, and you can contribute, not because you are going to get a lot of fame or whatever when you get back.

The excitement really didn't start to build until the trailer - which was carrying me, with a space suit with ventilation and all that sort of stuff - pulled up to the launch pad.

It's a very sobering feeling to be up in space and realize that one's safety factor was determined by the lowest bidder on a government contract.

I think all of us certainly believed the statistics which said that probably 88% chance of mission success and maybe 96% chance of survival. And we were willing to take those odds.

When I first looked back at the Earth, standing on the Moon I cried