If one universe comes out of another universe are there infiniely many universes

One theory is that one universe comes out of another. Stephen Hawking has even suggested that blacks holes cause a new universe to form. Once matter is crushed into non existence by a black hole, it more or less becomes matter in another universe. So would there be infinitely many universes, each inside another one, with no real first universe? Or are there a finite number of universes? That’s what’s not clear to me about this theory.

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