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In 1964 two astronomers were studying microwave signals from space
and noticed that there was a constant background signal coming from
all points in space. The type of signal was consistent with the
radiation emitted by an object which was at a temperature of
about 2.7 K.
Cosmic Microwave Background
This background is (nearly) uniform in intensity across the sky.
The big bang model theoretically predicts that such background
radiation would be present in the universe today some 12 or so
billion years after the initial big bang.