The space elevator will be built about 50 years after everyone stops laughing..

Those wanderers must have looked on Earth, circling safely in the narrow zone between fire and ice, and must have guessed that it was the favourite o….

To be a science fiction writer you must be interested in the future and you must feel that the future will be different and hopefully better than the….

I will not be afraid because I understand ... And understanding is happiness..

The intelligent minority of this world will mark 1 January 2001 as the real beginning of the 21st century and the Third Millennium..

My favorite definition of an intellectual: 'Someone who has been educated beyond his/her intelligence'..

Finding intelligent life would encourage people and also of course the opportunity of learning a tremendous amount, but this is a danger. We might be….

Any sufficiently advanced technology is indistinguishable from magic..

New ideas pass through three periods: 1) It can't be done. 2) It probably can be done, but it's not worth doing. 3) I knew it was a good idea all alo….

The only way to define your limits is by going beyond them..

I'm sure the universe is full of intelligent life. It's just been too intelligent to come here..

1. When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impos….

When one has to ask, "Am I really in love?" the answer is always "No"..

A well-stocked mind is safe from boredom..

Much blood has also been spilled on the carpet in attempts to distinguish between science fiction and fantasy. I have suggested an operational defini….

Please help keep the world clean: others may wish to use it. Logic is a systematic method of coming to the wrong conclusion with confidence. The on….

Floyd could imagine a dozen things that could go wrong; it was little consolation that it was always the thirteenth that actually happened..

The choice, as Wells once said, is the Universe-or nothing. . . . The challenge of the great spaces between the worlds is a stupendous one; but if we….

A hundred years ago, the electric telegraph made possible-indeed, inevitable-the United States of America. The communications satellite will make equ….

A precondition for being a science fiction writer other than an interest in the future is that, an interest - at least an understanding of science, n….

In this single galaxy of ours there are eighty-seven thousand million suns. [...] In challenging it, you would be like ants attempting to label and c….