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

question 109

Multiple Choice

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

• A)ionization.
• B)isotropy.
• C)annihilation.
• D)recombination.
• E)hydration.

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