Photo taken on Sept 11, 2018 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province. FAST has discovered 44 new pulsars so far. [Photo/Xinhua]

Photo taken on Sept 10, 2018 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province. FAST has discovered 44 new pulsars so far. [Photo/Xinhua]

A staff member works at China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province, Sept 11, 2018. [Photo/Xinhua]

Photo taken on Sept 11, 2018 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province. [Photo/Xinhua]

Photo taken on Sept 11, 2018 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province. [Photo/Xinhua]

Photo taken on Sept 11, 2018 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province. [Photo/Xinhua]

A worker maintains China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province, Sept 11, 2018. [Photo/Xinhua]

Photo taken on Sept 10, 2018 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province. [Photo/Xinhua]

Photo taken on Sept 10, 2018 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province. [Photo/Xinhua]

Staff members work at a control center of China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province, Sept 10, 2018. [Photo/Xinhua]

Photo taken on Sept 10, 2018 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province. [Photo/Xinhua]

Staff members work at a control center of China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in Southwest China's Guizhou province, Sept 10, 2018. [Photo/Xinhua]