China's large-scale neutrino experiment facility officially put into operation

On August 26, 2025, the Jiangmen Neutrino Experiment (JUNO) successfully completed its 20,000-ton liquid scintillator infusion and officially began data collection. After more than a decade of preparation and construction, the JUNO became the world's first operational large-scale, ultra-high-precision neutrino-dedicated large-scale scientific facility. The first data obtained during the trial run showed that the key performance indicators of the JUNO detector met or exceeded design expectations. This will enable the facility to address a major problem in particle physics for the next decade: neutrino mass ranking. It will also assist scientists in conducting cutting-edge research on neutrinos from the sun, supernovae, the atmosphere, and Earth, opening a new window into the exploration of unknown physics.