/sci/ - Science & Math

Two related Physics/cosmology questions:
First, is there a name for that one future scenario when all local galaxies fuse into a big supercluster, while all far galaxies drift away beyond the light boundary, so they're essentially undetectable by any means?
Second, what if the same kind of scenario has already happened in the past, where there was some sort of "particle boundary" for say, dark matter not being dark or primordial tachyons not flying beyond, just to name something, which makes them virtually undetectable and untestable beyond some point? Would it be 100% impossible to know or will there be some sort of inscrutable gap that at least tells you something's missing?

>>14667362
No, it's an umbrella term like the other Anon from /wsr/ said. It's synonymous to a paraphyletic clade, like "fish" which includes any vertebrate that swims and lives in water except for mammals, reptiles, amphibians, birds, etc.