By refocusing our space program on Mars for America's future, we can restore the sense of wonder and adventure in space exploration that we knew in the summer of 1969. We won the moon race; now it's time for us to live and work on Mars, first on its moons and then on its surface.

There's a historical milestone in the fact that our Apollo 11 landing on the moon took place a mere 66 years after the Wright Brothers' first flight.

There's no guarantee that the United States will be around 200 years from now.

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

What comes after the moon? I think you can guess: Mars.

American greatness was elevated significantly after Sputnik.

Sending a couple of guys to the Moon and bringing them back safely? That's a stunt! That's not historic.