The best proof that there's intelligent life in the universe is that it hasn't come here.

Excessive interest in pathological behavior was itself pathological

The exploration of the planets is now closer to us in time than the exploration of Africa by Stanley and Livingstone.

The universe must be full of voices, calling from star to star in a myriad tongues. One day we shall join that cosmic conversation.

I think in the long run the money that s been put into the space program is one of the best investments this country has ever made . . .This is a downpayment on the future of mankind. It's as simple as that.

Many, and some of the most pressing, of our terrestrial problems can be solved only by going into space. Long before it was a vanishing commodity, the wilderness as the preservation of the world was proclaimed by Thoreau. In the new wilderness of the Solar System may lie the future preservation of mankind.

The future is not to be forecast, but created.