"It may take endless wars and unbearable population pressure to force-feed a technology to the point where it can cope with space. In the universe, space travel may be the normal birth pangs of an otherwise dying race. A test. Some races pass, some fail."

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If two or three hundred years from now an earthbound civilization is dying ... and they look back at the opportunity that we have here at the close of the twentieth century to move out into space and they see that we didn't do anything with it ... I don't want history to judge us on having blown this opportunity, and I think history will judge us on this more than on any other issue.

— Paul Levinson