Fermi

Another Answer to Fermi's Paradox?

If universes nest in black holes, and the event horizon of black holes (largely?) prevent information transfer, there could be many civilizations: but nested so that the methods of communication we have are poorly suited to contact.

Actually, that doesn't answer the paradox -- the universe is as large as it was when Fermi asked the question; this is another example of just how large it might be. But it does throw up a new barrier to human understanding -- if we are nested in a black hole of some mother universe, how do we explore what lies beyond that horizon?

The walls of the world get farther away.