The CMB contains photons left over from the epoch in the universe's history when electrons recombined with nuclei.

Name: The CMB contains photons left over from the epoch in the universe's history when electrons recombined with nuclei.
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This is a well-established scientific fact, supported by numerous observations and measurements. The CMB radiation is often referred to as the "echo" of the early universe, and provides valuable clues about its structure, evolution, and composition.

The CMB Contains Photons Left Over from the Epoch in the Universe's