Neutrino astronomy

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Abstract
Observations of extraterrestrial neutrinos are reviewed. Solar neutrinos and supernovae neutrinos have been successfully detected and provided valuable information for astronomy and particle physics. Observation of the 1.9 K cosmic background neutrinos would be most challenging. It probably requires finite neutrino masses and ultrahigh-energy neutrinos of cosmological and perhaps of grand unified theory (GUT) related origin. Ultrahigh-energy neutrinos have not yet been observed, but they will provide a clue about the origin of cosmic rays, and probably exciting information about cosmology and GUT.