Researchers test an earth-based telescope in Chengdu, capital of southwest China's Sichuan Province, Aug. 17, 2016. China successfully launched the world's first quantum satellite from the Jiuquan Satellite Launch Center in northwestern Gobi Desert at 1:40 a.m. on Tuesday. Five earth-based telescopes distributed across the country will be used in the Quantum Experiments at Space Scale (QUESS), four of which were developed by the Institute of Optics and Electronics of the Chinese Academy of Sciences in Chengdu. (Photo/Xinhua)
