Astronomers using a CSIRO radio telescope have taken the Universe's temperature, and have found that it has cooled down just the way the Big Bang theory predicts.
MORE: http://www.sciencedaily.com/releases/2013/01/130123101622.htm
See also...
When the Universe was twice as hot
http://scienceblogs.com/startswithabang/2013/01/23/when-the-universe-was-twice-as-hot/
