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. What is this process called?

Question

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This process is called recombination, which refers to the epoch in the early universe when electrons and protons combined to form neutral hydrogen atoms, allowing the universe to become transparent to radiation for the first time.

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