eli5 What do we know about what’s outside the observable universe?

Question

eli5 What do we know about what’s outside the observable universe?

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Answer 1

As far as we know, everything outside of the observable portion of the universe is exactly the same (on average) as everything we can observe.

There is nothing to indicate that our small observable portion is special, different, or unique; we just happen to be here and able to observe it.