JUNO finds clues to neutrino-mass mystery

Researchers working on the Jiangmen Underground Neutrino Observatory (JUNO) experiment in Guangdong, China, have captured crucial details of how mysterious neutrino particles can switch between different types in flight. Neutrinos are so light that they were once thought to have no mass, and the standard model of particle physics doesn’t seem to explain why they do. Physicists use experiments such as JUNO to study how neutrinos ‘oscillate’, or change from one type to another, which is the first step in answering that question.