What exactly is the “Great Filter” theory, and how does it work?
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ELI5: The universe should be teeming with spacefaring civilization, all reaching out. It isn’t. Why?
* Is intelligence rare? This idea is that Humans are unique and that the universe could be full of non-intelligent life.
* Could a species be wiped out or wipe themselves out? War, pandemic etc takes out a species even if they are advanced.
* Could there be a combination of factors or an unknown factor that prevents a species from ever leaving their home planet?
That’s the great filter in a nutshell.
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