Weve got to go [back to the moon]. But we dont want to stay too long. ... The ultimate goal is Mars.

I've been to the Titanic in a yellow submarine and the North Pole in a Russian nuclear ice breaker.

Retain the vision for space exploration. If we turn our backs on the vision again, we're going to have to live in a secondary position in human space flight for the rest of the century.

Program Alarm, it's a 1202.

There are always door openings. And gradually, it accumulates. The opportunities open up in front of you.

My family has always supported my activities, whether it was doing combat in Korea, flying progressively and challenging fighter-jet aircraft in Europe, or studying for a doctor's degree at MIT. They have been always very supportive and understanding of the challenges and risks involved in my career. A family needs to work as a team, supporting each other's individual aims and aspirations.

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