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145

What do you think the Great Filter is? (lemmy.world)

submitted 5 months ago by Cryophilia@lemmy.world to c/asklemmy@lemmy.world

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The Great Filter is the idea that, in the development of life from the earliest stages of abiogenesis to reaching the highest levels of development on the Kardashev scale, there is a barrier to development that makes detectable extraterrestrial life exceedingly rare. The Great Filter is one possible resolution of the Fermi paradox.

https://en.wikipedia.org/wiki/Great_Filter

The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence. As a 2015 article put it, "If life is so easy, someone from somewhere must have come calling by now."

https://en.wikipedia.org/wiki/Fermi_paradox

Personally I think it's photosynthesis. Life itself developed and spread but photosynthesis started an inevitable chain of ever-greater and more-efficient life. I think a random chain of mutations that turns carbon-based proto-life into something that can harvest light energy is wildly unlikely, even after the wildly unlikely event of life beginning in the first place.

I have no data to back that up, just a guess.

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[–] Tlaloc_Temporal@lemmy.ca 2 points 5 months ago

It might have something to do with the available elements.

We live in a population I star system, full of crap spewed out from long dead stars. Perhaps it is exactly this crap (like copper, iron, nickle, manganese, and possibly the bulk of carbon and nitrogen) that allow life to develop with enough agility to survive mass extiction events with any kind of complexity.

Or perhaps it's exactly those mass extiction events that have allowed enough breathing room for new paradigms to take hold. Maybe our 5-7 mass extictions that didn't end life entirely are exactly what is needed to prevent stagnation. We just happen to be on the edge of dead and too slow.