Then there was the challenge to keep doing better and better, to fly the best test flight that anybody had ever flown. That led to my being recognized as one of the more experienced test pilots, and that led to the astronaut business.

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.

We had some adverse conditions in the '60s, in the '70s and the '80s. The agency has risen above that in the past and will rise above that again.

Obviously I was challenged by becoming a Naval aviator, by landing aboard aircraft carriers and so on.

I realized up there that our planet is not infinite. It's fragile. That may not be obvious to a lot of folks, and it's tough that people are fighting each other here on Earth instead of trying to get together and live on this planet. We look pretty vulnerable in the darkness of space.

Then I thought, with the same clubhead speed, the ball's going to go at least six times as far. There's absolutely no drag, so if you do happen to spin it, it won't slice or hook 'cause there's no atmosphere to make it turn.

If somebody'd said before the flight, 'Are you going to get carried away looking at the Earth from the Moon?' I would have say, 'No, no way.' But yet when I first looked back at the Earth, standing on the Moon, I cried.