"The telescope is called FAST, or the Five-hundred-meter Aperture Spherical Telescope.
On Thursday, technicians began inserting the 4,450 triangular, reflector panels into place. This whopping reflector will dwarf all other radio telescopes when it comes to its dish size, measuring 500 meters (1,640 feet) in diameter. Each equilateral triangle panel has a side length of 11 meters (36 feet). The second largest radio telescope built, the Arecibo Observatory, is in Puerto Rico and is 305 meters (1,000 feet) across in diameter.
The telescope will be nestled comfortably in a valley in the Karst depression located in the Guizhou province. This site was chosen because It is ideally located in isolation from towns or residents; there is a 5-kilometer (3 mile) area around the dish separating it from any people and therefore, any interference. A 500-meter telescope is a sensitive instrument and needs 'radio silence' to pick up accurate signals.