I don't think the human race will survive the next thousand years, unless we spread into space. There are too many accidents that can befall life on a single planet. But I'm an optimist. We will reach out to the stars.

Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do.

I'm sorry to disappoint science fiction fans, but if information is preserved, there is no possibility of using black holes to travel to other universes. If yo…

All of my life, I have been fascinated by the big questions that face us, and have tried to find scientific answers to them. Perhaps that is why I have sold mo…

All civilizations become either spacefaring or extinct.

It is still an open question as to whether mankind or insects shall ultimately inherit the earth. It is my opinion that mankind ... has about a 50-50 chance....

Development of the space station is as inevitable as the rising of the sun; man has already poked his nose into space and he is not likely to pull it back...