Eighteen wide-field-of-view Cherenkov telescopes are part of the Large High-Altitude Air Shower Observatory in Daocheng, Sichuan province. [Photo by Wang Qin/For China Daily] Having passed appraisal, facility to help shed light on high-energy cosmic rays China's Large High-Altitude Air Shower Observatory, one of the world's most advanced cosmic ray observatories, passed national appraisal on Wednesday. The facility will help scientists uncover the origins of high-energy cosmic rays and expand humanity's knowledge of the universe. Cosmic rays are high-energy particles consisting mainly of protons and atomic nuclei that travel through space at nearly the speed of light. Since their discovery in 1912, such rays have fascinated scientists because their electric charge, energy, speed and other properties can contain critical scientific information about their origins and that of the universe. The facility, also known as LHAASO, sits at an altitude of 4,410 meters ...