Why Did the Era of Nuclei End When the Universe

question 82

Multiple Choice

Why did the era of nuclei end when the universe was about 380,000 years old?

• A) All the free particles had combined to form the nuclei of atoms.
• B) The universe had expanded and cooled enough for stable, neutral atoms to form.
• C) Atomic nuclei were finally able to escape the plasma of the early universe.
• D) Photons were finally able to escape the plasma of the early universe and were no longer available to produce hydrogen and helium nuclei.
• E) The nucleosynthesis era that produced the nuclei heavier than helium ended.

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