Math 2.0

Astronomy and astrophysics Large-scale structure and physical cosmology Concept

Recombination

Summary

In cosmology, recombination is the epoch when free electrons and nuclei first combined into neutral atoms, mainly hydrogen. It happened when the universe had cooled to about 30003000 K, at a redshift of about 11001100, some 380 000380\,000 years after the Big Bang. Soon after it, photons stopped scattering on free electrons, and the light released then is the cosmic microwave background.

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Further reading

  1. Web https://en.wikipedia.org/wiki/Recombination_(cosmology)
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Changed3 November 2026

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