Recombination

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Notion

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History and politics

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What Wikipedia says

In cosmology, recombination refers to the epoch during which charged electrons and protons first became bound to form electrically neutral hydrogen atoms. Recombination occurred about 378000 years after the Big Bang (at a redshift of z = 1100).

Excerpt from the Wikipedia article “Recombination (cosmology)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Roque345, CC BY-SA 3.0, via Wikimedia Commons.