Deuterium and helium could be made only during the nuclear epoch.
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Q2: String theories, like GUTs, explain how gravity
Q3: Deuterium was made only in primordial nucleosynthesis,
Q4: When an electron is formed from a
Q5: The density of the cosmos at the
Q6: Not taking dark energy into account, we
Q7: The collision of two gamma rays can
Q8: At decoupling, the electrons and protons were
Q9: The protons, neutrons, and electrons of our
Q10: In pair production, the heaviest particles are
Q11: Decoupling refers to interactions between matter and
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