You're picturing the expanding universe as if it were expanding linearly from a point in 3-dimensional space. That's not how it works. It's expanding in all directions at once, not just one direction. It's a bit like an ant standing on a balloon as it's being inflated and asking where's the point on the balloon's surface that the expansion originated from. There is no origination in the two dimensions represented by the surface of the balloon. Likewise, the origin of the Big Bang requires a fourth coordinate ... time.
You're picturing the expanding universe as if it were expanding linearly from a point in 3-dimensional space. That's not how it works. It's expanding in all directions at once, not just one direction. It's a bit like an ant standing on a balloon as it's being inflated and asking where's the point on the balloon's surface that the expansion originated from. There is no origination in the two dimensions represented by the surface of the balloon. Likewise, the origin of the Big Bang requires a fourth coordinate ... time.
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