I have learned to use the word 'impossible' with the greatest caution.

We can lick gravity, but sometimes the paperwork is overwhelming.

Basic research is what I am doing when I don't know what I am doing.

I'm convinced that before the year 2000 is over, the first child will have been born on the moon.

It will free man from his remaining chains, the chains of gravity which still tie him to this planet. It will open to him the gates of heaven.

There is just one thing I can promise you about the outer-space program: your dollar will go further.