How long after the Big Bang did it take the universe to cool to the threshold temperature
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How long after the Big Bang did it take the universe to cool to the threshold temperature for the formation of muons? What would be the mass of a particle-antiparticle pair that could be formed by the average energy of the current 2.725 K background radiation?
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Figure 1334 Muon rest energy 208m 106MeV...View the full answer
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