CMB Cold Spot

The CMB Cold Spot or WMAP Cold Spot, also Eridanus Supervoid (English ) is a region of the sky in which the cosmic microwave background radiation (CMB ) over the agent has an unusually extensive and unusually large deviation. The " cold spot " is about 70 μK colder than the average of the CMB temperature (about 2.7 K), where the root mean square of typical variations in temperature is only 18 μK. A possible explanation for the cold spot is a huge gap between the earth and the CMB cold spot. Cavities can have a cooler area than the surrounding lines of sight from the late time integrated Sachs - Wolfe effect to produce.