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Temperature of the Universe

`T_"(Universe)" = 2.72548 "Kelvins"`
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The average temperature of the Universe as a whole is measured from astronomical observations taking measurements of background microwave radiation, and from numerous other techniques.

A study from 20091 produced conclusions that the cosmic microwave background (CMB) temperature is  2.7260 ± 0.0013 K.

  1. ^ http://adsabs.harvard.edu/abs/2009ApJ...707..916F