"Since, in the long run, every planetary society will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring — not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive."
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Original Language: English
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Sources
Carl Sagan, p. 371, Pale Blue Dot (1994)
https://en.wikiquote.org/wiki/Planetary_civilization
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Planetary civilization
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