science-junkie: The Physics of Extraterrestrial Civilizations The late Carl Sagan once asked this question, “What does it mean for a civilization to be a million years old? We have had radio telescopes and spaceships for a few decades; our technical

science-junkie: The Physics of Extraterrestrial Civilizations The late Carl Sagan once asked this question, “What does it mean for a civilization to be a million years old? We have had radio telescopes and spaceships for a few decades; our technical

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