I don't know if this question is even relevant, but I wonder about it so I'm asking it. I understand from GR that matter and energy are essentially interchangeable, that matter can be converted to energy and vice versa. I also understand that the earliest "snapshot" of our cosmos (via the background radiation) was a plasma of matter and energy. But, if I understand everyone correctly, we predict that this plasma came from the annihilation of matter and antimatter. So we began with matter and antimatter, then that was converted into a plasmic mixture of matter and radiation. So am I correct in saying that energy came from matter?