What exactly is the “Great Filter” theory, and how does it work?
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The universe is huge. The observable universe, less so, but still quite huge. It’s been around for quite some time. It is speculated that life probably existed before us.
Why, then, have we not seen evidence of such life?
We would expect to see evidence of any radio-using spacefaring life – especially a Kardashev-2 or -3 civilization. However, we don’t see any. Why not? What barrier stands between primordial life and kardashev-2 civilization, which has prevented any alien race before us from reaching it?
This barrier is ‘the great filter’.
It is possible that ‘the great filter’ is math, or language, or abstract thought, and we humans have already been lucky enough to pass it.
It is possible that the great filter is nuclear weaponry, and we are still teetering on the edge of oblivion.
It is possible that the great filter is something we have not yet discovered.
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