According to the Fermi paradox, there are multiple filters and a great filter that civilizations have to pass to keep evolving. What are these barriers?
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The Fermi paradox is that statistically, with so much universe, there should be lots of intelligent life out there. Yet humans haven’t met aliens.
There could be many reasons, but the broad categories are that:
A. Humans and Earth are just that special somehow- we are the first or only intelligent life to evolve
B: there is some reason that space faring can’t happen- maybe the speed of light is the fastest anything can go. Maybe the societies of intelligent life have a limit.
The great filter is that second category.
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