There is an estimated 100 billion (100,000,000,000) galaxies in the observable universe. An estimated 60% of these are spiral galaxies. Assuming one advanced civilization per spiral galaxy exists or existed, 60 billion advanced civilizations exist or existed.
Submitted November 24, 2022 at 12:21AM by BoredGeek1996 https://ift.tt/HZDx4Ff
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