There's a theory that the universe we live in is itself inside a giant black hole. No idea how it is supposed to have gotten so biig.
For everyone else reading the thread, let me summarize. The article agrees with me:
> the entire observable universe exists within a black hole—except, that is, for all the evidence to the contrary
>....
> It does not seem likely that we live inside a rotating universe, let alone a black hole.
(I'm not thinking this is too much to ask; saying it's wrong might require empirical support, but the claim that it's "nonsense" should be easier to justify.)
It really looks nothing like a black hole.
I mean, everything in our universe does move towards something. The future.
As another comment pointed out, in GR our "future" is a singularity which everything moves towards (so what we see as a time dimension).
"Expanding" and "contracting" depend on your coordinate system. If your rulers are shrinking, you can't tell this from space expanding.
The common factor here is you are wanting to use our reference frame (somewhere in this universe, not near a black hole) to describe things as they would be seen from other reference frames.
How would we know the size? Relative to what?