How Many Advanced Extraterrestrial Civilizations Are in Our Galaxy Today?

How astronomers calculate this number using the Drake Equation.

Artist rendering of a red alien planet in outer space.
Artist rendering of a red alien planet in outer space. Source: Storyblocks.

How many advanced extraterrestrial civilizations are in our Galaxy today? Believe it or not, there are many astronomers who have tried to estimate an answer. That’s because whether we (intelligent lifeforms) are alone in the Universe…

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