Wow, that is a really good question. And I think the answer is that they haven’t disproved it yet – but that’s as much as they know. I once talked to a scientist who wanted to measure the coming and going of parallel (other) universes using the same ideas we use in evolution -the best ones will win and produce more universes and the bad ones will die out.
It all sounds crazy to me – but then again, this space physics (what they actually call quantum physics) always does! They are some VERY clever people.
There are plenty of theories, but what matters is coming up with a theory where you can do a test to tell the difference between ‘there are other universes’ and ‘there *aren’t* other universes’. Since there’s no experiment, it’s sensible to assume the simpler option, which is that there is only one Universe, until we’ve seen evidence that shows otherwise.
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