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Cosmic neutrinos, background forms in spaces now about 10 light years in radio. Strop it. And next after that you have electron, positron, and annihilation. And temperature drop and photons don't have enough energy to create electron, positron pairs, electrons and positrons destroy each other producing photons. And right after that we have the Big Bang and nuclear synthesis. And this is where proton and neutron glue together to make early nuclei. Hydrogen, hydrogen, helium, helium form. Fyrical space is now much larger and re-use again. And that baryonic density is around 4 grams per cubic meter. And recombination.