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I, myself, am not sure, but one common theory is the big bang. so if you take Einsteins equation of E=MC squared, then you'd be able to backtrack by taking all the matter in the universe, and multiplying it by the speed of light squared, and thats how much energy there was. you can also flip the equation around, which is how everything was created from nothing.

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12y ago

What else can I help you with?