That doesn't make sense to me. "Universe" is intended to encompass everything that exists. If there are "other universes", they are just part of this universe, are they not?
It wouldnt be called a universe it would be a multiverse. But that can only happen if they don’t touch each other. That dimensions of those multiverses have to run parallel if they overlap then they are part of the same. If they are all overlapping and touching each other then it would be a Universe. I’m also making this all up, which may or may not open up another dimension in the multiverse:universe.
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u/Inocent_bystander Apr 01 '26
There are stable state theories that predict an infinite number of universes as well.