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https://en.wikipedia.org/wiki/False_vacuum_decay
It’s about a hypothetical event in quantum field theory that potentially can erase the entire universe as we know it.
This is always the one I go to to really freak people out. The idea that there's no way you can influence it so you shouldn't actually worry about it takes a while to set it.
There’s also no way for us to see it coming. Once it happens somewhere in the universe it will approach us at light speed destroying everything in its path. The moment we have a chance to even learn about its existence it will kill us faster than the billionaires in the sub.
I mean, I'm kind of okay with that? We all die eventually; I would rather mine be going from "alive" to "not" all at once, without the "prolonged illness and/or other suffering" phase in the middle.
Do we know for sure if the fine structure constant is actually constant now? That could stop atoms from existing. iirc