The moon is essentially gray, no color. It looks like plaster of Paris, like dirty beach sand with lots of footprints in it.

Back in those days, going to the moon, geology was important, ... But how do we train pilots to be geologists? We concentrated on observing, not the analytical parts of the rocks.

Mars is a long ways away. The moon is only 240,000 miles, but Mars is in the millions. It's too risky without spending more time going to the moon.

In space-flight terms, six landings on the moon back in the Sixties and Seventies doesn't mean much.

There are people who make things happen, there are people who watch things happen, and there are people who wonder what happened. To be successful, you need to be a person who makes things happen..

The moon is essentially gray, no color; looks like plaster of Paris or sort of a grayish beach sand.