Has the solar 'missing neutrino' problem been solved?

Well...not really, but it is beginning to look like neutrinos have a small amount of mass after all, and that enroute to the earth, the ones that were expected to be detected changed into ones for which the experiment was not designed to detect leading to the missing neutrinos. It is still too soon to say that this 20 year old problem has been solved.

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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the
NASA IMAGE/POETRY Education and Public Outreach program.