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stupid question: if at the beginning of the universe (before the big bang) all the matter was in the very same spot, shouldn't this have been effectively been a black hole due to the extreme density? if so, how could it explode if nothing can escape a black hole?

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Black holes may contain a second event horizon in the center, like a Poisson's spot. So it was the Big Rip, when this spot was born.

That's not a stupid question. But I suggest reading the linked article which pretty much covers this.

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