Observatory for detecting cosmic rays begins scientific observation in China's Sichuan

A researcher and a worker maintain water Cherenkov detectors in Daocheng County, southwest China's Sichuan Province, April 28, 2019. An observatory for detecting cosmic rays in southwest China's Sichuan Province recently began scientific observation as it launched operation of its first set of detectors. The project, known as Large High Altitude Air Shower Observatory (LHAASO), is located in the mountains of the eastern Qinghai-Tibet Plateau at an altitude of 4,410 meters. (Xinhua/Jin Liwang)