Key term for Edexcel GCSE Physics, used in The Universe.
Low-frequency electromagnetic radiation filling the universe, interpreted as the leftover heat or remnant radiation from the early stages of the Big Bang.
Cosmic Microwave Background Radiation (CMBR) appears in Edexcel GCSE Physics revision content for Astronomy, especially The Universe and CMB Radiation.
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Astronomy
The Universe • Theories of Universe Origin
