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This lesson covers the Big Bang theory and its supporting evidence — as required by the Edexcel GCSE Physics specification (1PH0), Topic 7: Astronomy. This is a Paper 2 topic. You need to understand what the Big Bang theory states, know the two key pieces of evidence (red-shift and cosmic microwave background radiation), and understand why the CMBR is the strongest evidence.
The Big Bang theory states that:
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