China's Large High Altitude Air Shower Observatory (LHAASO) is pictured in Daocheng, southwest China's Sichuan Province on July 6, 2021. Based on the observations of China's LHAASO, one of the country's key national science and technology infrastructure facilities, Chinese scientists have measured the brightness of the standard candle in high-energy astronomy. They achieved an accurate measurement in the ultra-high energy band from 0.3 to 1.1 PeV (1 PeV is equivalent to one quadrillion electronvolts) for the first time, thus calibrating the brightness of the standard candle over an unprecedented energy range. (The Institute of High Energy Physics of the Chinese Academy of Sciences/Handout via Xinhua)
