Comment by throwaway81523

2 days ago

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.

If you assume constant density, anything becomes a black hole at certain volume. The question is: is our universe big enough to be a black hole or not.

It couldn't have, the theory is nonsense.

  • https://www.scientificamerican.com/article/do-we-live-inside...

    • I hate random links being thrown at me, because I don't know what you are trying to tell me. Perhaps you can spare a few key strokes.

      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.

  • You have elsewhere in this thread objected to people providing links without giving context, so I hope you won't mind being asked to unpack this claim a little. Why is it nonsense? If, as you say, it's principally pushed by one person, who is that, and why does that argue against it?

    (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.)

    • First of all, black holes have an interior and an exterior. Our universe only has an interior. Next, black holes have a singularity into which everything vanishes, or at least moves towards. Im our universe, everything moves away from a singularity. So if anything, it resembles a white hole more than a black hole. Also, our universe is expanding, whereas black holes shrink (unless matter falls into them, which can't happen to our universe because it has no exterior).

      It really looks nothing like a black hole.

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