The solar neutrino problem was solved when we realized neutrinos change types when they pass through matter.

Question

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The solar neutrino problem was initially observed when the number of detected neutrinos from the sun was much lower than predicted by the standard solar model. It was later discovered that neutrinos change types, or oscillate, as they pass through matter, which affects their detection by experiments. This phenomenon, known as neutrino oscillation, solved the solar neutrino problem.

The Solar Neutrino Problem Was Solved When We Realized Neutrinos