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 | | For many years the number of solar electron neutrinos detected on Earth was only a third of the number expected, according to theories describing the nuclear reactions in the Sun, a result that was termed the solar neutrino problem. |
| | Theories proposed to resolve the problem either looked to reduce the temperature of the interior of the Sun to explain the lower neutrino flux, or posited that electron neutrinos could oscillate, that is, change into undetectable tauon and muon neutrinos as they traveled between the Sun and the Earth. |
| | Several neutrino observatories were constructed, including the Sudbury Neutrino Observatory and Kamiokande, to try to measure the solar neutrino flux as accurately as possible, and results from these led to the eventual discovery that neutrinos have a very small rest mass and can indeed oscillate. |
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