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Cold Spot

(CMB Cold Spot, WMAP Cold Spot)
(unusually colder spot in the CMB)

A Cold Spot (or Cosmic Microwave Background Cold Spot or Wilkinson Microwave Anisotropy Probe Cold Spot) is an area where the CMB indicates a slightly lower Black Body Temperature than expected, a difference on the order of 70 millionths of a Kelvin degree. The CMB black body temperature has a random distribution around a value near 2.7K except for these areas. Some research suggests they correspond to Voids.