The Five-hundred-meter Aperture Spherical Telescope (FAST) nicknamed Tianyan "Heavenly Eye" or "The Eye of Heaven"), is a radio telescope located in the Dawodang depressiona natural basin in Pingtang County, Guizhou Province, southwest China.
It consists of a fixed 500 m (1,600 ft) dish constructed in a natural depression in the landscape.
Construction on the FAST project began in 2011 and has been completed in
July 2016. It is expected to be operational by September 2016. It will be the world's largest filled aperture (single dish) radio telescope, and the second largest radio telescope (after the Russian RATAN-600, which has a sparsely filled aperture). Originally budgeted for CN¥700 million, the final cost was CN¥1.2 billion (US$180 million).World’s largest radio telescope FAST in SW China's
