I don’t know. There are several theories that include them, and in some ways it makes things much easier.
Why is the universe like it is? Well its just one of many parallel universes, all slightly different and the one we’re in just happens to be right.
There may only be this universe, and then we need to discover exactly why it is like it is.
I don’t believe in them personally, but it would certainly make things interesting, having all those extra Universes to think about! 😀 Even if there were though, I’m not sure how we would know about them.
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