- Physicists narrow down neutrino’s mysterious mass. The most advanced attempt yet to weigh neutrinos has put a new upper limit on the enigmatic particle’s mass. It is no heavier than 0.45 eV — less than one-millionth the mass of an electron, the next-lightest known particle at 511,000 eV. https://www.nature.com/articles/d41586-025-01157-1 23 comments science
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