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What is something that definitely should not exist?
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this post was submitted on 26 Nov 2023
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Okay, yeah, I'm familiar with the argument. I'm not alone in being unconvinced, though. There's a lot of exoplanets, including rocky ones around very old stars. Honestly, I felt assuming just a billion years of potential alien arrival was conservative.
Fairly unrelated to this discussion, but I'll link it because it's cool: there's a detectable echo of radiation from our galaxy being more active just a couple centuries ago, at least momentarily.
I don't know enough about the radiation one of those galaxies produce to comment on whether it could be sterilising. A thick enough atmosphere can block pretty much anything, though.