I feel we need to remind the world about the Apollo missions and that we can still do impossible things.

I think it's inevitable that there will be Earthlings establishing a presence on Mars. And I would say that it would certainly take place by 2050 or shortly thereafter.

I didn't start skiing until I was 50. My wife Lois taught me how to ski. I'm proficiently conservative.

The guys who walk on Mars are going to be historic.

If we go back to the moon, we're guaranteed second, maybe third place because while we are spending all that money, Russia has its eye on Mars. Landing people on the moon will be terribly consuming of resources we don't have. It sounds great - 'Let's go back. This time we're going to stay.' I don't know why you would want to stay on the moon.

Like actors and writers who are on and off again in terms of employment, I had a very unstructured life.

As a student, I wrote English reports on science fiction.