3 ms·

I think they are referring to https://en.m.wikipedia.org/wiki/Great_Filter https://en.m.wikipedia.org/wiki/Great_Filter

• 7thaccount 4y ago
  Yeah, great filter is just one of those things that tries to explain why we don't see signs of alien life everywhere we look in the cosmos. Everything looks dead. Why? Maybe life is incredibly hard to take off and even with a bazillion planets, a chance of 0.0000000000001% might mean we really are alone in the galaxy. A different one is that life is incredibly common, but developing sentience is so rare that we're the only ones. These are the better options as we're already past these hurdle. What if it's incredibly common for sentient life to evolve that makes machines and all the things we do, yet the entire galaxy still seems dead? Well that would be very bad for us as it means there is a big "filter" ahead for us. Perhaps there are millions of dead civilizations amongst the cosmos that died from solar disruptions, gama ray bursts, asteroids, climate change, nuclear Armageddon, or a superior alien species bent on the eradication of all other life?