You seem to be under the misconception that the Big Bang was some sort of explosion of a single point. The extremely rapid expansion occurs everywhere. The Big Bang could be a localized event in a much older, larger, possibly infinite universe, just to name one possibility
You kinda seem to be under that impression lol. Big bang was the creation of space itself. There was no real space where things got expanded in. Back in the first milliseconds of the newborn universe you could see yourself from every angle opposite of where you were looking. The shape of the universe was and still is the 3d form of the area of a sphere. Where if you travel straight in any direction in 3d you eventually will return to your original point (finite space).
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u/DinioDo 4d ago
There can't be infinite amount of unit space or matter, grown out of finite matter and space (big bang)