Cosmic Microwave Background Radiation: A Homogeneous and Isotropic Universe

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TrickyDicky
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does the CMB radiation fill the universe empty space completely homogenously and isotropically?
 
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WMAP says it is pretty homogenis - at least within .001 percent.
 
Chronos said:
WMAP says it is pretty homogenis - at least within .001 percent.

Cool. Does this energy radiation filling the universe follow relativity laws? Or in other words, does it exert gravitational force as energy density with a non-vanishing stress-energy tensor?