Combo photo taken on Aug. 28, 2019 shows China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) under maintenance in southwest China's Guizhou Province. China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST), the world's largest single-dish radio telescope, has identified 93 new pulsars since October 2017, the research team announced Friday. (Xinhua/Ou Dongqu)