Where is the world's largest radio telescope?

The Five-hundred-meter Aperture Spherical Telescope, or FAST, is located in Guizhou province in southwestern China. Its giant reflecting dish is 500 meters wide, making it the largest single-dish radio telescope in the world. The telescope opened in 2016 and is used to detect pulsars, map hydrogen gas, and search for faint cosmic radio emissions. Its enormous size gives it extraordinary sensitivity, allowing astronomers to study very weak signals from deep space.