A Brief Timeline of the Universe – The Photon Epoch [Part II]

sciencefic-to-fact: When we last left off, the universe was a mere second old and everything was brand new. Now we’re moving on towards more familiar horizons (and comprehensible timescales), and on to…. The Photon Epoch. 10 Seconds Old– Leptons and antileptons (such as electrons and positrons) annihilate each other, leaving a small amount of leptons …

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