Event Signals | Signal Simulator

With the help of a helium balloon, a technician tries to gently maneuver around on the surface of China's FAST, the world's largest single-dish radio telescope, to conduct maintenance work. As the telescope's surface cannot bear too much pressure, the helium balloon helps to offset the technician's weight by cutting it to one-sixth of his original weight. #Roadtoxiaokangsociety | CGTN