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What Was the Temperature of the Universe When Photons Were

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What was the temperature of the universe when photons were no longer able to spontaneously create proton-antiproton pairs? (Note that a photon's energy is equal to What was the temperature of the universe when photons were no longer able to spontaneously create proton-antiproton pairs? (Note that a photon's energy is equal to , the cosmic background at any point in time has a blackbody spectrum that peaks at a wavelength , and the mass of a single proton is 1.67*10<sup>-</sup><sup>27</sup> kg.) , the cosmic background at any point in time has a blackbody spectrum that peaks at a wavelength What was the temperature of the universe when photons were no longer able to spontaneously create proton-antiproton pairs? (Note that a photon's energy is equal to , the cosmic background at any point in time has a blackbody spectrum that peaks at a wavelength , and the mass of a single proton is 1.67*10<sup>-</sup><sup>27</sup> kg.) , and the mass of a single proton is 1.67*10-27 kg.)

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