cosmic microwave background
Also known as CMBR, MBR, CMB, relic radiation, microwave background radiation, cosmic microwave background radiation, cosmic background radiation
electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology
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The cosmic microwave background is leftover radiation from the very early universe, shortly after the Big Bang occurred. Scientists study it because it provides direct evidence about the universe's origin and earliest conditions.
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Temperature map of the cosmic microwave background measured by the Planck spacecraft
Expansion · Future