I've been saying for a long time that I'm hoping to find intelligent life in Washington.

Across the gulf of centuries, the blind smile of Homer is turned upon our age. Along the echoing corridors of time, the roar of the rockets merges now with the creak of the wind-taut rigging. For somewhere in the world today, still unconscious of his destiny, walks the boy who will be the first Odysseus of the Age of Space.

Behind every man now alive stand thirty ghosts, for that is the ratio by which the dead outnumber the living.

In the long run, there are no secrets. in science. The universe will not cooperate in a cover-up.

When the Sun shrinks to a dull red dwarf, it will not be dying. It will just be starting to live and everything that has gone before will merely be a prelude to its real history.

Our lifetime may be the last that will be lived out in a technological society.

The limits of the possible can only be defined by going beyond them into the impossible.