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Astronomy · L4 · The cosmic microwave background: recombination, decoupling, and anisotropies · flowchart

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by @openstemUpdated Astronomy
Hot, ionised plasma(T > few thousand K)Recombination(z ≈ 1100, t ≈ 380,000 yr)electrons bind to protonsPhoton decoupling(mean free path growsfrom tiny to effectively infinite)Photons stream freelythrough expanding spaceObserved CMB todayT ≈ 2.73 KUniverse expands and coolsRedshift by factor ~1100

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