All civilizations become either spacefaring or extinct.

Absence of evidence is not evidence of absence.

All of the books in the world contain no more information than is broadcast as video in a single large American city in a single year. Not all bits have equal …

A millennium before Europeans were willing to divest themselves of the Biblical idea that the world was a few thousand years old, the Mayans were thinking of m…

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 p…

Since, in the long run, every planetary society will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring - not b…

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...