That's not nessacarily from the Big Bang, it is plausible, but there could be other ways of that occurring
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Such as?
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I can't think of any examples but I am pretty sure there could be other explanations and theories, the Big Bang is a theory itself after all
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I feel like people do not understand what a theory means. A theory in science is some thing that has been well researched and has proof to support it. Not to say that you don't know what a theory is.