Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become space faring...

Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become space faring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive... If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds.

quote by Carl Sagan
Submitted by Catalin Popescu
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