Some theories that predict other universes that exist alongside ours but we haven’t seen any evidence for them as far as I’m aware. I like the idea that there an infinite number of universes and that everything every choice has happened in a universe somewhere but that doesn’t mean that’s what’s necessarily there and I’d need some evidence to believe in them.
there could be, but probably we will never be able to know the answer to this question, by definition (if they were observable, they would be part of this universe)
Some of our theories predict that there are other universes like ours, but we don’t know if these theories are right yet.
We don’t have any evidence yet for the existence of other universes, and it’s very hard to see how we would ever know they were there.
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