One theory which can no longer be taken very seriously is that UFOs are interstellar spaceships.

Good morning, doctors. I have taken the liberty of removing Windows 95 from my hard drive.

Any sufficiently advanced technology is indistinguishable from magic.

When I start on a book, I have been thinking about it and making occasional notes for some time... So I have lots of theme, locale, subjects and technical ideas... I don't worry about long periods of not doing anything. I know my subconscious is busy.

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.

This is the first age that's ever paid much attention to the future, which is a little ironic since we may not have one.

The one fact about the future of which we can be certain is that it will be utterly fantastic.