Discover what it took to build the largest filled-in, single-dish and most sophisticated radio telescope on the planet. Completed in 2016, the Five-hundred-meter (1640 feet) Aperture Spherical Telescope (FAST) is now ready to scan the skies from Guizhou Province, southwest China. This engineering colossus will help astronomers explore galaxies and planets billions of light years away, and might help discover extraterrestrial life.