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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Quick note: these aren’t filters that we know for sure exist, they’re just *possible* filters that stop species from becoming intelligent, spacefaring civilizations, and there’s no definitive list, iirc. They’re broadly split into two groups, those bring ones humanity had already passed and those we have yet to pass.
The already passed filters include:
– planets with conditions for life are just rarer than we think
– life (or intelligent life) is just really rare
– development of modern-level technology is rare either because species can’t hit a certain necessary bar (like aquatic life being unable to use fire or the possibility that maybe humans are just really good inventors even among all intelligent life) or they kill themselves before
The to be passed filters include:
– development of nuclear technology usually leads to a nuclear apocalypse before a species can colonize other plants
– industrial ages run a species home planet into the ground before they can set up independent colonies and most species can’t cooperate enough to stop it
– another spacefaring alien specie kills of other species once they hit a certain technology level
– there’s some technological barrier or challenge we don’t yet know about that kills of or prevents development past a certain point
I’d have to look em up to find all the big ones, but does that give you an idea?
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