The WMAP mission reveals the conditions of the early universe by measuring the comic microwave background radiation in the sky. Using the temperature difference that is measured in a procedure called anisotropy, the WMAP project tells us about the structure of the universe. This site contains information about the WMAP project, its goals, and technical papers on the topic.
The Wilkinson Microwave Anisotropy Probe (WMAP) Team. (n.d.). Wilkinson Microwave Anisotropy Probe (WMAP). Retrieved May 22, 2013, from http://map.gsfc.nasa.gov/index.html
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