What was formed as the universe expanded and cooled down?
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As space expanded, the universe cooled and matter formed. The heat of creation smashed atoms together with enough force to break them up into a dense plasma, an opaque soup of protons, neutrons and electrons that scattered light like fog.
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As space expanded, the universe cooled and matter formed. One second after the Big Bang, the universe was filled with neutrons, protons, electrons, anti-electrons, photons and neutrinos. ... During the first three minutes of the universe, the light elements were born during a process known as Big Bang nucleosynthesis.
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