If we have learned one thing from the history of invention and discovery, it is that, in the long run-and often in the short one-the most daring prophecies seem laughably conservative.

Space can be mapped and crossed and occupied without definable limit; but it can never be conquered.

We seldom stop to think that we are still creatures of the sea, able to leave it only because, from birth to death, we wear the water-filled space suits of our skins.

The rash assertion that "God made man in His own image" is ticking like a time bomb at the foundation of many faiths.

Deep beneath the surface of the Sun, enormous forces were gathering. At any moment, the energies of a million hydrogen bombs might burst forth in the awesome explosion.... Climbing at millions of miles per hour, an invisible fireball many times the size of Earth would leap from the Sun and head out across space.

I don't believe in God but I'm very interested in her.

If children have interests, then education happens.