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 Originally Posted by MadMojoMonkey
Why was it expanding, and not collapsing under the curvature of spacetime caused by that much mass-energy in that small a volume?
Umm... because it was rotating at an incomprehensible rate, and therefore inertial forces were of the order required to do battle with gravity? That's my best guess.
It has been transformed predominantly into heat and the gravitational potential energy stored in the curvature of spacetime.
Right, so the energy still exists. The "annhiliation" of the matter and antimatter isn't annihilation in the context of "obliteration", it's to "convert to radiation". So all that matter and antimatter that was annihilating each other in the very early universe, it still contributes to the mass of the universe, because its energy remains part of the system. It's still "stuff".
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