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13.75 billion years ago, the Universe started out in an extremely small, hot, and dense state known as a singularity. This singularity was nothing but energy. Then, in the Big Bang event, this singularity rapidly expanded to trillions of times its original size in less than a second. The Universe rapidly cooled from trillions to millions of degrees, and energy began to condense into subatomic particles called quarks and gluons. Protons, neutrons and electrons formed, creating the first atoms. Hydrogen was the first element, and continues to be the most abundant.

At first, the Universe was opaque. When it cooled down enough photons could escape and the Universe became transparent.

Millions of years later, gravity pulled together clouds of hydrogen to form the first stars. Stars synthesized all the heavier elements through nuclear fusion, such as helium, carbon, and oxygen. Furthermore, gravity pulled stars together into galaxies.

It would take thousands to millions of years for the Universe to cool to the temperature it is today, and it continues to expand today.

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Q: How did the universe evolve?
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