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@dtekdahl00

Strangely enough quantum physics has a very round about answer to that. The expansion, by the way its not an explosion its an expansion there was nothing to explode in. It wasn't a point in space time it was all matter, energy, and space time collapsed into a very small point.

The explanation Quantum Mechanics seems to give us is this. The expansion is a byproduct of a mathematical probability. Technically anything that can happen will eventually happen. The probability is never zero, and if it take a trillion times the life span of our universe it still could happen today or tomorrow, or end up having happened yesterday.

Frankly I put more stock in the more modern theories, but the anarchist in me finds something quixotic about the notion that, because something can happen it eventually must happen. Ironically if there was a clock going on during all of this. Nobody was there to watch it so it seems completely timely to us. Like someone waiting twenty years in a room waiting for you to show up. When you come in the timing seems sublime to you, and you can't really appreciate that the person actually spent twenty years waiting for you to come along.

There really isn't a satisfying answer I am afraid. We are still chasing the chicken and the egg analogy. Even if you spin up alternate universes you still have to justify those universes, and how all the universes got spun up in the first place. By invoking probabilities, or multiple universes, or whatever new theory comes along you just seem to refine and push back the clock a few more inches until you have to explain the next chain in events.