The universe had expanded and cooled enough for electrons to combine with nuclei to form neutral atoms.
The universe is all of space and time and its contents, along with planets, stars, galaxies, and all other forms of count number and strength. The huge Bang theory is the winning cosmological description of the improvement of the universe.
When the universe was about 380,000 years old universe had expanded and cooled enough for electrons to combine with nuclei to form neutral atoms.
It took 380,000 years for electrons to be trapped in orbits around nuclei, forming the primary atoms. These were mainly helium and hydrogen, that is still by means of far the maximum abundant factors in the universe. Gift observations propose that the primary stars fashioned from clouds of gasoline around hundred and fifty–200 million years after the Big Bang. Heavier atoms such as carbon, oxygen, and iron, have in view that been constantly produced in the hearts of stars and catapulted at some stage in the universe in marvelous stellar explosions known as supernovae.
Therefore, the event that made photon move freely in the universe as the universe had expanded and cooled enough for electrons to combine with nuclei to form neutral atoms.
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