The cosmic background radiation comes from a time

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The cosmic background radiation is the residual heat left over from the Big Bang. It was emitted approximately 380,000 years after the Big Bang when electrons began to recombine with nuclei to form atoms. Prior to this, the early universe was primarily a plasma of free electrons and protons, which prevented the formation of atoms and therefore limited the distance that light could travel. As the universe cooled, electrons began to combine with nuclei, allowing light to travel freely and resulting in the cosmic microwave background radiation that we observe today.

The Cosmic Background Radiation Comes from a Time