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Advanced civilizations before humans

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Humans are not as important as we like to think. Compared to the age of the universe and planet Earth, our existence is basically insignificant. Our planet is about 4.5 billion years old. In comparison, scientists predict that modern Homo sapiens have only existed for 200,000 years. Given this, is it not quite possible other advanced civilizations have existed on this planet, but so long ago…

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