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At an age of 500,000 years, the temperature of the universe had fallen to 3000 K, and electrons ...

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At an age of 500,000 years, the temperature of the universe had fallen to 3000 K, and electrons ...

At an age of 500,000 years, the temperature of the universe had fallen to 3000 K, and electrons could then combine with protons to produce neutral hydrogen gas. What major transition took place in the universe at this time?
A)   The present laws of physics began to apply for the first time.
B)   The universe suddenly lost its electrical charge and become neutral.
C)   Nuclear fusion no longer occurred below this temperature.
D)   It became transparent to light for the first time.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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