The Big Bang is actually an attempt to explain why every single thing in the Universe is moving away from every other thing in the Universe. (there is indisputable evidence for this, but too many cannot bother with looking at evidence) If you go "backwards" in time, then eventually you reach a time/place where everything that exists was very very close to everything that exists. That initial expansion is what is referred to as "the big bang," which is NOT what scientists call it, but what laymen call it because they need everything simplified into grade school terminology.
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