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The big bang theory is a theory that the universe originated from a big explosion.

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The universe started about 14,000 million years ago, with very much heat which later with time its been expanding causing it to cool down.

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Particle Physics dominates:
Up to 10⁻⁶ seconds, the universe is extremely hot that none of the ¨normal¨ physics such as gravity act weird.

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To about 1 second, the universe beings to cool by very little while sub-atomics are being created.

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At about a second, After a second has passed it is now cool allowing normal elements such as hydrogen exist. By having hydrogen in the universe it was used as one of the pieces of evidence for the theory.

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At about 380,000 years, The universe is cool enough to form atoms. This is when the cosmic microwave background radiation was formed which was also another factor towards the theory.

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After 400 million years, Gravity helped the first stars form in the universe

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1000s of millions of years, galaxies began to form

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about 5000 million years ago, In our galaxy, the milky way the solar system began to form.

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today the universe persist of planets, stars, galaxies, etc. As it is still expanding astronomers are trying to see what will end it all.