America can take man to the moon, and America can take men to Mars - and beyond.

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

I'm sure that there are places in the deserts in Australia that could be similar to where we might want to go on Mars.

It was designed to have an impact on the stalemate over Mutually Assured Destruction with the Soviet Union. Us reaching the moon convinced Gorbachev and other leaders that the Soviet Union couldn't compete with the U.S., so they revised their agenda. But people have short memories.

From the distance of the moon, Earth was four times the size of a full moon seen from Earth. It was a brilliant jewel in the black velvet sky.

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.

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