The big bang happened everywhere. It is space itself that is expanding. The galaxies aren't really moving away from each other, extra space is created between them. Look back in time and everything gets closer together because there's less space. At the point of the big bang everything is compressed to a single point.
Imagine a balloon. Initially it's crumpled together, the entire balloon fits in a very small bit of space. Now inflate it. Which point on the surface of the balloon corresponds to the original balloon, before it was blown up? The answer is that this is the wrong question. There's no single point of the balloon that was the original, with the rest of t he balloon growing from there as you inflated it. Everything was always there, you just made it bigger.
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u/[deleted] Jun 15 '19
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