Only a large-volume market like space travel can attack the barrier of high costs.

There were about six years when there was not one American who went into space. We shouldn't do that again.

The government needs a role in carrying out exploration. They will be leading the development of the engines that are needed, and the private sector will take advantage of those.

I don't believe any pair of people had been more removed physically from the rest of the world than we were.

My favourite thing to do on this planet is to scuba dive.

Globalisation means many other countries are asserting themselves and trying to take over leadership. Please don't ask Americans to let others assume the leadership of human exploration. We can do wonderful science on the Moon, and wonderful commercial things. Then we can pack up and move on to Mars.

This has been far more than three men on a mission to the Moon; more still than the efforts of a government and industry team; more, even, than the efforts of one nation. We feel this stands as a symbol of the insatiable curiosity of all mankind to explore the unknown.