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Cosmic Background Explorer

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

Cosmic Background Explorer (COBE) A NASA satellite launched in 1989November to map the cosmic microwave background (CMB). It carried three sets of instruments: a group of three Differential Microwave Radiometers (DMRs) to look for irregularities in the CMB; the Far-Infrared Absolute Spectrometer (FIRAS) to measure the spectrum of the CMB; and the Diffuse Infrared Background Experiment (DIRBE) to search for infrared radiation from forming galaxies. COBE's most important results were the discovery of irregularities in the CMB on the level of 1 part in 105, and the confirmation that the spectrum of the CMB is a black body with a temperature of 2.73 K.

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