Combined photo shows picture of the sunset view of the Five-hundred-meter Aperture Spherical Telescope (FAST) at a karst valley in Pingtang County of southwest China's Guizhou province taken on July 24, 2014 (up) and picture of the nearly-done project of FAST taken on June 27, 2016. [Photo provided by the National Astronomical Observatories of Chinese Academy of Sciences and Xinhua]