It does’t really make sense to talk about ‘beyond’ the universe; the universe contains all of space and time. It’s the space within the universe that is expanding!
(Happy to be proved wrong on this one though!)
As Ed says, everything is contained in the universe so the concept of outside the universe doesn’t really make sense. But even so, I sometimes think about it and wonder if there is something ‘beyond’ as it’s hard to imagine something not being enclosed within something else! I really struggle sometimes to get my head around concepts like this!
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