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supposing the rest of the universe follows OUR laws of physics... either it is ever expanding or it isn't; so you'd keep going or find a wall.
since OUR laws of physics probably dont pertain to the entire universe, im sure many things could happen.
I think it is soo vast that it would be impossible to ever completely explore.
since there is no way to test any of these hypothesis, your question is left unanswered, as many are about our universe.
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