trestres said:
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You're talking about the multiverse, which is believed by a lot of scientists but not at the moment supported by much evidence. Just some maths. That doesn't change the definition of what our universe is though. Nobody is claiming that our universe is the only matter and energy, just that our universe is a broadly closed system with a finite amount of matter and energy. Also we don't know what's beyond the observable universe, apart from that it is no longer the universe. We have (amazingly and completely gobsmackingly awesomely) observed the edge of the universe. It's one of the strongest pieces of evidence for the big bang, we observed the radiation that the theory predicted would be there.
Also "It's still a theory" is the oldest and most annoying line in the book. In science a theory does not change to a fact once it has enough evidence that it is true. In science a theory is simply "This is the mechanism that explains these observations". If something is a mechanism to explain observations it remains a theory no matter how much evidence there is behind it.








