The process by which a free electron combines with a positively charged ion to form a neutral atom, often accompanied by the emission of photons. This process balances photoionization and determines the ionization equilibrium in astrophysical plasmas.
From Latin 're-' (again) and 'combinare' (to combine), literally meaning 'combining again.' The astronomical usage developed as scientists studied how ionized gas in space returns to neutral states.
Recombination is like cosmic matchmaking where lonely electrons find their perfect ionic partners! When this happens in space, it creates some of the most beautiful colors we see in nebulae - each type of atom produces its own signature colors when electrons cascade down through energy levels.
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