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

There is very little doubt, in my mind, that what the next monumental achievement of humanity will be the first landing by an Earthling, a human being, on the planet Mars.

I poured the wine into the chalice our church had given me. In the one-sixth gravity of the moon the wine curled slowly and gracefully up the side of the cup. It was interesting to think that the very first liquid ever poured on the moon, and the first food eaten there, were communion elements.

I don't go through life verbalizing what I feel.

The energy varies with the square of the velocity, so if you need five times the velocity, that's 25 times the energy.

I was lucky enough to have been born on this planet earth, in this admirable country of the United States of America.

By venturing into space, we improve life for everyone here on Earth - scientific advances and innovations that come from this kind of research create products we use in our daily lives.