The world's largest single-dish radio telescope -- Five hundred meter Aperture Spherical Radio Telescope (FAST) -- has received its first signals from space. The behemoth, nestled in a natural crater in Guizhou Province in southwest China, will now be tested for three years before it becomes fully operational. "This is very exciting," Peng Bo, FAST deputy project manager, told the BBC. "For many years, we have had to go outside of China to make observations -- and now we have the largest telescope. People can't wait to use it."