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Astronomy · L3 · Timeline of the Early Universe

From the hot, dense early Universe through the release of the cosmic microwave background to the galaxies and expansion we observe today.

Astronomy
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Hot, dense early UniverseRapid inflation and expansionLight element fusion: H and He formOpaque plasma: photons scatter constantlyUniverse cools enough for atoms to formPhotons travel freely: the CMB is releasedGalaxies and large-scale structure formExpansion continues today: Hubble's law
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