As the Universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as

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Recombination is the process in which neutral atoms, such as hydrogen or helium, form when electrons combine with ions (in this case, protons) to create neutral atoms. This happened when the temperature of the Universe cooled to around 3,000 K, which allowed electrons to combine with protons and form neutral hydrogen.

As the Universe Cooled, It Eventually Reached a Temperature of 3,000