At decoupling, the electrons and protons were made from neutron decay.
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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
Q9: The protons, neutrons, and electrons of our
Q10: In pair production, the heaviest particles are
Q11: Decoupling refers to interactions between matter and
Q12: Including all energy and mass, both dark
Q13: Quarks are made up of subatomic particles,
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