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There is absolutely know way of knowing. So far we only intelligent civilization that we know of is our own. We have no idea of how common life is in the universe, let alone intelligent life. The number is probably too high for the observable universe. If there are 12.6 quadrillion civilizations in the observable universe of 100 billion galaxies, that gives us an average of 126,000 civilizations for an average galaxy. Since our galaxy has more stars than most that would suggest that there are several hundred thousand civilizations in the Milky Way, perhaps over a million. Suggesting so many civilizations exist in our galaxy would invoke the question of Fermi's paradox: where is everybody?

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9y ago

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