How has the black body helped prove the big-bang theory?

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According to the theory, the explosion should have left a remnant black-body cosmic background radiation that is uniform in all directions and has an equivalent temperature of only a few degrees Kelvin. Such a uniform background, with a temperature of 2.7°K (see Kelvin temperature scale ), was discovered in 1964 by Arno A. Penzias and Robert L. Wilson ...