Charles Duke quotes:

Two months after I got out of test pilot school, I saw an advert that said NASA was recruiting more astronauts. The best job you could have as a test pilot was being an astronaut, so I volunteered.

Of course, mankind would not have landed on the Moon in 1969, were it not for two things: conquered Nazi rocket technology and post-war anti-Communist paranoia in the United States.

I think a Moon base is not necessary to get to Mars, but I think it will be helpful. It would give you a chance to develop and mature some systems; long duration, deep space stuff; and you're close enough to get some help, via radio from Earth.

Roger, Tranquility. Be advised there are lots of smiling faces in this room and all over the world. Over.

My walk on the moon lasted three days. My walk with God will last forever.

Roger, Tranquility. We copy you on the ground. You've got a bunch of guys about to turn blue. We're breathing again. Thanks a lot.

The only time I had what you would call life-threatening fear was when I was on the Moon. Towards the end of our stay, we got excited and we were going to do the high jump, and I jumped and fell over backwards. That was a scary time, because if the backpack got broken, I would have had it. But everything held together.

I think the future of lunar bases has to be somewhere around the South or North Pole. You have less variation in temperature and more daylight hours.

Roger, we're go on that alarm

Buzz Aldrin doesn't think we need to go back to the Moon - that we should go straight on to Mars. I'm more on the side that says we should go back to the Moon. I think there's a lot we can utilise the Moon for scientifically.

Roger, we copy. It was beautiful from here, Tranquility. Over.

The Moon was the most spectacularly beautiful desert you could ever imagine. Unspoilt. Untouched. It had a vibrancy about it and the contrast between it and the black sky was so vivid, it just made this impression of excitement and wonder.

We've been to the Moon nine times. Why would we fake it nine times, if we faked it?

I'm proud to be an American, I'll tell you. What a program and what a place and what an experience.

I was able to look out the window to see this incredible sight of the whole circle of the Earth. Oceans were crystal blue, the land was brown, and the clouds and the snow were pure white. And that jewel of Earth was just hung up in the blackness of space.

It was a texture. The blackness was so intense.