Space is what stops everything from happening in the same place.

I have never grown up, but I will never stop growing.

To find anything comparable with our forthcoming ventures into space, we must go back far beyond Columbus, far beyond Odysseus-far, indeed, beyond the first ape-man. We must contemplate the moment, now irrevocably lost in the mists of time, when the ancestor off all of us came crawling out of the sea.

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

The best measure of a man's honesty isn't his income tax return. It's the zero adjust on his bathroom scale.

A wise man once said that all human activity is a form of play. And the highest form of play is the search for Truth, Beauty and Love. What more is needed? Should there be a ‘meaning’ as well, that will be a bonus? If we waste time looking for life’s meaning, we may have no time to live — or to play.

At the present rate of progress, it is almost impossible to imagine any technical feat that cannot be achieved - if it can be achieved at all - within the next few hundred years.