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The chapter presents the key properties and the evolution of satellite measurements before diving into the history of various explanations of the CMB. The shape of the CMB spectrum reflecting the black body radiation and its unusual isotropy are the essential properties telling us about the origin, but its temperature is also dependent on other contingent factors. The chapter briefly discusses details of the physical process behind such properties and the relevance of their ever-more precise satellite measurements and presents these in diagrams.
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