Calculate properties of the Cosmic Microwave Background (CMB) radiation, including its temperature, peak wavelength, and energy density. The CMB is the remnant radiation from the Big Bang.
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Last scattering: z ≈ 1100
Current CMB temperature: 2.725 K
How this calculator works
CMB temperature at redshift z equals the current CMB temperature (2.725 K) times (1 + redshift). Peak wavelength from Wien's law.
Common questions about this calculator
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