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LQpYP TIL The Universe was so hot and dense after the big bang that it took 360,000 years for the first atoms to form. The proton and neutron formed atomic nuclei shortly after the big bang but the electrons were free of their orbit for hundreds of thousand of years.
QNMrp TIL it took ~400,000 years following the Big Bang for the Universe to cool down enough to allow atoms to form
6Eaew TIL stars didn’t exist until 150-200 million years after the Big Bang