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All matter was conglomerated into a singularity - a point with basically no volume but extremely high mass and "infinite" density. Something (which is currently indeterminate by science) made this unstable and the universe began expanding rapidly.

The resulting energies moved the matter apart and resulted in much radiation being formed; the matter which was left over consisted of only the most basic subatomic particles in plasma form for quite some time.

After a very short time, along the order of a microsecond from the start, annihilation of matter-antimatter pairs began, repeating for different types of particle at different time up to about a second after the start.

Following that, the usual cosmic events followed: nuclei collide and form heavier nuclei, radiation is bounced around, and everything cools down enough to allow "normal" things to happen.

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