During one phase of the Big Bang, gamma-ray photons were creating electrons and positrons (anti-electrons). At this time, the Universe also contained ____.

Name: During one phase of the Big Bang, gamma-ray photons were creating electrons and positrons (anti-electrons). At this time, the Universe also contained ____.
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The Answer of During one phase of the Big Bang, gamma-ray photons were creating electrons and positrons (anti-electrons). At this time, the Universe also contained ____.

During One Phase of the Big Bang, Gamma-Ray Photons Were