= Cosmic neutrino background last-scattering surface
The cosmic neutrino background last-scattering surface is the locus from which relic neutrinos that reach an observer underwent their final appreciable scattering. Although <neutrino decoupling> occurs before <photon decoupling>, a massive neutrino travels slower than light after becoming nonrelativistic, so its last-scattering surface need not be farther away than the <Cosmic microwave background> last-scattering surface.
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