The world’s largest filled-aperture radio telescope, the Five-hundred-meter Aperture Spherical Telescope, or FAST, has been pulling in tourists and astronomy buffs to a once-out-of-the-way geological depression in southwestern China’s Guizhou province since it achieved “first light” (astronomy jargon for first use) in September 2016. Visitors are amazed by the gigantic, futuristic iron-bowl-like telescope reflectors, made of 4,600 […]