Cosmic neutrino last scattering surface.

@article{Dodelson2009CosmicNL,
  title={Cosmic neutrino last scattering surface.},
  author={Scott Dodelson and M. Vesterinen},
  journal={Physical review letters},
  year={2009},
  volume={103 17},
  pages={
          171301
        }
}
Neutrinos decoupled from the rest of the cosmic plasma when the Universe was less than one second old, far earlier than the photons, which decoupled at t = 380,000 years. Surprisingly, though, the last scattering surface of massive neutrinos is much closer to us than that of the photons. Here we calculate the properties of the last scattering surfaces of the three species of neutrinos. 

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