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Pohan
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Where can I read theories on what the universe is expanding into and what gave rise to the big bang?
...it is beyond the model of the Big Bang to say what the universe is expanding into or what gave rise to the Big Bang. Although there are models that speculate about these questions, none of them have made realistically testable predictions as of yet.
Where can I read theories on what the universe is expanding into and what gave rise to the big bang?