Cosmic background radiation

In cosmology, the cosmic microwave background radiation (most often abbreviated CMB but occasionally CMBR, CBR or MBR, also referred to as relic radiation) is a form of electromagnetic radiation discovered in 1965 that fills the entire universe . It has a thermal 2.725 kelvin black body spectrum which peaks in the microwave range at a frequency of 160.2 GHz, corresponding to a wavelength of 1.9 mm. Most cosmologists consider this radiation to be the best evidence for the Big Bang model of the universe.
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Noun
1. (cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin
(synonym) CBR, cosmic microwave background radiation, CMBR, cosmic microwave background, CMB
(hypernym) cosmic radiation
(classification) cosmology, cosmogony, cosmogeny

. Weak electromagnetic radiation which is believed to be a remnant of the radiation released during the decoupling of matter and energy, several hundred thousand years after the big bang. The peak wavelength of the emission is in the microwave region of the electromagnetic spectrum. The emission profile itself, corresponds to a black body radiation curve of temperature three Kelvin. When this radiation was released, it was very much hotter but, as it has travelled through space to reach the Earth, it has been red-shifted enormously. The discovery of this radiation, which was announced by Arno Penzias  and Robert Wilson  in 1965, provided great support to the big bang model of cosmology. The background radiation appears to be isotropic: it comes from all parts of the sky with equal intensity. Slight variations in the intensity of the background radiation have been detected using the satellite COBE (Cosmic Microwave Background Explorer). The variations are very small, typically only one part in ten million, but they show that the distribution of matter in the early universe was not uniform. It is these ripples that formed the seeds of the galaxy clusters we see throughout the universe today.

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