What Happened to the Energy from Matter/Anti-Matter Annihilation?

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In the early universe, matter and anti-matter annihilated in massive collisions, resulting in a significant amount of energy. This energy contributed to the cosmic microwave background radiation observed today. The annihilation process left behind a surplus of energy that did not convert into matter, leading to the current understanding of the universe's thermal history. The cosmic microwave background serves as a remnant of this energy, providing insights into the conditions of the early universe. Overall, the energy from matter/anti-matter annihilation is now detected as part of the cosmic microwave background.
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I've read how in the early early universe, there were massive amounts of collisions between matter and anti-matter, about a billion of each annihilated to every atom left over.
My question is, what happened to all that energy?
 
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phetuspolice said:
I've read how in the early early universe, there were massive amounts of collisions between matter and anti-matter, about a billion of each annihilated to every atom left over.
My question is, what happened to all that energy?

Without going into a lot of detail, it is the cosmic microwave background.
 

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