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Quite simply, the universe consists of everything we know. There are no proven thories of so-called "extrauniversal" matter at this time so everything we know as fact, is contained within the universe and is apart of the universe itself. Theoretically, knowing of anything extrauniversal would require that the observer also exist outside of the universe, just like how it is impossible for humans to properly perceive anything that exists in 4 spacial dimensions and just like how humans only see in 2 dimensions (If humans perceived in 3 dimensions, you would see the back of everything as well as the front at the same time).

So as far as factual evidence goes, the universe consists of everything.

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11y ago

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