The cosmic microwave background is a faint glow of light left over from the Big Bang. It fills the entire sky and records the Universe's early history. Two independent experts outline what we know about this ancient light, both theoretically and observationally.
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Steffen Richter, Harvard Univ. Brian Keating
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Spergel, D., Keating, B. The oldest cosmic light. Nature 518, 170–171 (2015). https://doi.org/10.1038/518170a
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DOI: https://doi.org/10.1038/518170a
