The best way to study Mars is with two hands, eyes and ears of a geologist, first at a moon orbiting Mars... and then on the surface.

Some things just can't be described. And stepping onto the moon was one of them.

I was given permission to serve myself Communion, with wine and a wafer, on the surface on the Moon. But I was advised not to say anything about it at the time. Someone had strongly objected to the Apollo 8 crew reading from the Bible. We didn't want to get into any further trouble with the religious critics.

I think both the space shuttle program and the International Space Station program have not really lived up to their expectations.

Neil Armstrong was the first man to walk on the moon. I am the first man to piss his pants on the moon.

America must dream again, and have the faith to achieve the dream.

I participated with great honor in becoming one of the first to land on the moon, and now I am devoting and have devoted many years of my life to enabling Americans to lead international nations to permanence on the planet Mars.