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(astronomy) Faint thermal radiation that pervades all space and is thought to be the remnants of the big bang, produced during the epoch of recombination.

Temperature map of the cosmic microwave background measured by the Planck spacecraft

(astronomy) Faint thermal radiation that pervades all space and is thought to be the remnants of the big bang, produced during the epoch of recombination.

Graph of cosmic microwave background spectrum around its peak in the microwave frequency range, as measured by the FIRAS instrument on the COBE. While vastly exaggerated "error bars" were included here to show the measured data points, the true error bars are too small to be seen even in an enlarged image, and it is impossible to distinguish the observed data from the blackbody spectrum for 2.725 K.

(astronomy) Faint thermal radiation that pervades all space and is thought to be the remnants of the big bang, produced during the epoch of recombination.

Example Multipole Power Spectrum. WMAP Data are represented as points, curves correspond to the best-fit LCDM model