The Shuttle is to space flight what Lindbergh was to commercial aviation.

Astronomy, as nothing else can do, teaches men humility.

There is a special sadness in achievement, in the knowledge that a long-desired goal has been attained at last, and that life must now be shaped toward new ends.

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.

Getting information from the internet is like getting a glass of water from the Niagara Falls.

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

I want to be remembered most as a writer - one who entertained readers, and, hopefully, stretched their imagination as well.