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The Big Bang is a scientific theory about how the universe started, and then made the stars and galaxies we see today.
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THe first stars began to form about 200 mya out of Aging and Dying stars. These stars formed from hydrogen and helium atoms.
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Chemicals began to bond and form new chemical gasses. After the aging and dying stars, their collapse and supernovae is what caused new chemical elements to be formed. Extremely high temperatures were necessary to fuse nuclei and create new chemical elements.
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