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Then what basis would anyone have for believing in such things?
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I didn't say I believe in them, just that that is what other universes are. Other concentrations of matter far away are indeed as you pointed out, part of our universe, but that is not what is meant at all by other universes.
As it is other universes are a result of some and a solution to other physics equations. They drop out like fruit from a tree. Testing such claims is the tricky part, which is why I reserve judgement, fascinating a it is.
I'm always interested when I hear of possible ways to test it.