cosmic background radiation


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cosmic background radiation

Unresolved radiation from space. The cumulative effect of many unresolved – and individually weak – discrete sources provides the background at radio, X-ray, and possibly other wavelengths. One important form is the microwave background radiation, which peaks at about 1 mm wavelength (i.e. a frequency of 3 × 1010 hertz). This is considered to be due to the hot Big Bang. See also COBE; gamma-ray astronomy; infrared background radiation; radio source; X-ray background radiation.

cosmic background radiation

[′käz·mik ¦bak‚grau̇nd ‚rād·ē‚ā·shən]
References in periodicals archive ?
Most cosmologists' eyes understandably are on the latest detailed observations of the cosmic background radiation, especially since the findings of NASA's MAP (Microwave Anisotropy Probe) satellite will be released to the public shortly after this issue of Sky & Telescope goes to press.
Indeed, says Lahav, by measuring clustering properties at large redshifts (up to z = 2), deep surveys "will fill in the gap between the cosmic background radiation ripples of 14 billion years ago and the here and now of the 2dF survey.
If the Milky Way and other galaxies are streaming across the heavens, they move relative to the cosmic background radiation, researchers have assumed.
These distant galaxies, unlike the Milky Way and its neighbors, would appear at rest with respect to the cosmic background radiation.
That velocity -- toward the Orion constellation -- doesn't match in speed or in direction the velocity that researchers assume our galaxy must have to explain a familiar pattern in the cosmic background radiation.
Planck will survey subtle irregularities in the cosmic background radiation left over from the Big Bang and thus provide a definitive test of galaxy-formation theories.
Because Smoot received enormous publicity in the wake of COBE's discovery of structure in the microwave cosmic background radiation, it is easy to see how this mistake was made.
While traveling through space, cosmic rays encounter photons of the cosmic background radiation that gradually rob the particles of their energy.
This book is intended to answer all the questions asked of George Smoot, principal investigator for the Cosmic Background Explorer (COBE) satellite, so he can presumably get back to analyzing his data on variations in the cosmic background radiation.
Peterson is a member of one of several research teams using ground- and balloon-based telescopes to search for temperature fluctuations in the cosmic background radiation on an angular scale of about 1|degree~.
Peterson and his Princeton colleague Mark Dragovan hope to get around these problems with the South Pole Cosmic Background Radiation Anisotropy (COBRA) project.