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neutrino astronomy

The observation of neutrinos emitted by celestial objects. Neutrinos pass through large quantities of matter without significant absorption. For example, a neutrino produced by the nuclear processes in the Sun's core has only one chance in 1010 of being absorbed in escaping from the Sun. However, observations have detected only about one-third the number of neutrinos from the Sun predicted by theory (see solar neutrino unit).

Bursts of neutrinos are predicted to be produced in supernova explosions, and such a burst was detected from Supernova 1987A. Neutrinos can be detected in several ways. One uses the neutrino's interaction with the chlorine isotope 37C1, which produces radioactive argon, 37Ar. Detectors have also been built which utilize the conversion of gallium to germanium by a neutrino (71Ga to 71Ge). Neutrino telescopes detect the direction from which the neutrino comes, as well as its existence. These rely on the neutrino colliding with an electron inside a large tank of water. The electron is then detected via its Cerenkov radiation.

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