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GCSE Physics · key term
Faint microwave radiation detected from all directions in space, understood as radiation left over from the hot early Universe.
Used by Edexcel
Specification 7.15P · Paper 1
Revise: CMB RadiationIn the 1960s, astronomers detected faint microwave radiation arriving from every direction in space. It is called the cosmic microwave background, or CMB. It is nearly uniform across the sky and corresponds to a temperature of about 2.7 K.
For an ‘explain’ question, link the observed CMB to the hot early Universe predicted by the Big Bang model, then explain why this favoured it over Steady State.
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