Essay
What was the temperature of the universe when a typical CMB photon was no longer able to spontaneously create a proton and antiproton pair? Note that a photon has an energy equal to E hc/λ,the CBR at any point in time has a blackbody spectrum that peaks at λpeak = (2,900 μm K)/T,and the mass of a single proton is 1.7 × 10−27 kg.
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