Workers work at a construction site 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 4,443 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/Ou Dongqu) 

A worker works at a construction site of the Five-hundred-meter Aperture Spherical Telescope, or "FAST," in Pingtang County, southwest China's Guizhou Province, June 30, 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 4,443 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/Ou Dongqu) 

A worker works at a construction site of the Five-hundred-meter Aperture Spherical Telescope, or "FAST," in Pingtang County, southwest China's Guizhou Province, March 9, 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 4,443 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/Ou Dongqu) 

A worker works at a construction site of the Five-hundred-meter Aperture Spherical Telescope, or "FAST," in Pingtang County, southwest China's Guizhou Province, June 30, 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 4,443 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/Ou Dongqu)