Nuclear Winter with Ann Druyan and Brian Toon
StarTalk Radio
How Many Civilizations Are There in the Universe?
Karl was trying to figure out how many civilizations there were in the galaxy we lived in. And he concluded that they destroyed themselves very quickly. As soon as they developed the understanding of atoms and the energy that send mass, they would start fighting amongst themselves and destroy their civilizations. We think it would be so dark at the surface of the earth that od be like a moonless night. Human beings would barely beve as daylight would be like amoonless night.
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