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===About The Cosmic Microwave Background===
: The '''CMB''' shows that at some point in the past all the [[matter]] in the [[Universe]] was at roughly the same [[temperature]] everywhere. This shows that the [[Universe]] must have once been very small.
===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Cosmic microwave background (CMB) radiation, page 127, GCSE Physics, Pearson Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Cosmic microwave background radiation, pages 192, 193, GCSE Physics, CGP, Edexcel '']