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From the Planck time onward, however, the theory is more successful. The density of energy was so high that particles of matter could form and decay spontaneously, in accordance with einstein's famous e=mc2 equation. As the universe expanded, density and temperature dropped, and the mass of the particles that could form in this way grew smaller, until, after one microsecond (one millionth of a second), the temperature dropped below 1,800 trillion °F (1,000 trillion °C), and matter could no longer form.

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