PINGTANG, June 29, 2016 -- A working staff walks past the edge of a dish-like reflector of the Five-hundred-meter Aperture Spherical Telescope, or "FAST," in Pingtang County, southwest China's Guizhou Province, June 29, 2016. FAST, the world's largest ever radio telescope, has a dish-like reflector, which is 500 meters in diameter and made up of 4,450 panels. Now technicians have assembled 99.8 percent of the panels. The assembling work of the reflector will be completed on July 3. The telescope will be used to detect and collect signals and data from the universe. (Xinhua/Liu Xu)