Originally posted by @apathist
We move in, all the big things die.
I think this is part of the reason we are quarantined.
This would surprise me not. Aliens may be being extremely careful to keep signals we could recover from reaching us.
It may not matter though, we could theorize only one advanced life form gets to live in a galaxy. So we could in that situation listen to radio waves, IR, laser and so forth and there would be nothing but there would be one in Andromeda and one in each of the Magellenic clouds, and the problem there is it takes for instance minimum of 175,000 odd years for signals to reach us from the clouds and a million years to reach us from Andromeda.
So we get nothing.
Or only say 10 advanced civilization can exist at the same time in any given galaxy and in a galaxy 100,000 ly like ours more or less, would be average 10,000 light years apart so the signals could pass each other like ships in the night, say a wavefront of signals 5000 years long (the length of time a civilization either does it and then can't or does it and its technology advanced to the point they don't need RF or lasers anymore, whatever reason, that wavefront say started out 50,000 years ago and passed us by 45,000 years ago, only 45,000 years too early for our tech to catch the wave.
Or conversely, a signal starts out today and we don't even have the possibility of receiving it for 10,000 years which does us no good because our tech civilization may only last say 5000 years max. So no signals picked up EVER. `