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==Key Stage 4==
[[File:CosmicMicrowaveBackgroundCMB.png|right|300px|thumb|This image shows the [[temperature]] variations of the early [[universe]]. The different colours represent around 10<sup>-4</sup>K [[temperature]] variation.]]
===Meaning===
The '''cosmic microwave background''' ('''CMB''') is the [[radiation]] left over from the [[Big Bang Theory|big bang]] which comes from all directions in [[space]].