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The theory that the universe expanded and cooled, progressively developing into stars and galaxies.

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The fact that Helium is one of the most abundant elements on earth supports the idea of the BBT because Helium is claimed to be one of the first elements ever formed. The fact that Helium was one of the first main elements, and that it is still so abundant supports the BBT.

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This was discovered in 1929 by Edwin Hubble, using redshift data. He concluded that since the light coming from other galaxies is redshifted, the other galaxies must be moving away from The Milky Way, therefore the universe had to be constantly expanding.

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There is still microwave radiation from approximately 400 million years ago after the Big Bang.

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Galaxies began to form

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The first star is formed; Cosmic Microwave Background, and the universe cools enough to form atoms

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The universe continues to expand, temperatures continue to cool, and

Hydrogen (95%), helium (5%), lithium (trace amounts) form.

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Temperature cools to approximately 100 billion Kelvin. Protons, electrons, and neutrons are formed.

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The universe first forms and is very dense with a temperature of 1032 Kelvin