China has officially activated the world’s largest neutrino detector, a massive underground observatory designed to study the universe’s most mysterious particles. Neutrinos travel through planets, stars, and entire galaxies almost untouched — and understanding them could unlock answers about the origin of matter, dark energy, and the evolution of the cosmos. • The detector is located deep underground to shield it from cosmic radiation, allowing it to capture extremely rare neutrino interactions

On August 26, 2025, the Jiangmen Underground Neutrino Observatory (#JUNO) successfully completed the filling of 20,000 tonnes of liquid scintillator and began formal data collection. Located 700 meters underground in Guangdong, southern China, this massive facility is now the world's first ultra-large, ultra-precision neutrino experiment. Initial data shows its performance exceeds design expectations. This milestone allows scientists to tackle one of the biggest questions in particle physics: de