1. As the first 300,000 years pass, what happens to the temperature
of the universe?

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According to research it claims that "Lower temperatures allowed electrons and nuclei to form stable atoms of hydrogen, helium, and a little lithium. When particles formed, there were no more charged particles to scatter photons. ... The universe became transparent to photons."Everywhere was more hot, dense universe. ... This was the moment of first light in the universe, between 240,000 and 300,000 years after the Big Bang, known as the Era of Recombination. The first time that photons could rest for a second, attached as electrons to atoms.

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