"Critically, in the first few minutes of the universe's existance, the prevailing temperatures and pressures enabled subatomic particles to coelece into hydrogen and helium nuclei, with only the barest tracest of heavier elements. When the universe cooled further, 380,000 years later, electrons continued with the hydrogen and helium nuclei, forming neutral atoms and releasing the cosmic microwave background radiation (CMB)."
Astronomy Magazine March 2021 "How to Grow a Giant Black Hole" p. 19
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