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In the early universe as described by the big bang models: transition that occurs at cosmic time around 300 000 years. At this point, the universe has cooled down sufficiently for atomic nuclei and electrons to form atoms - without immediately being ripped apart by electromagnetic radiation. The etymology of recombination does not quite correspond to the physics - this is not a re-combination, it is the first such combination in the universe as we know it. In the process, the cosmic background radiation decouples from the material universe.


  • recombination phase