2021-03-15 08:05:16 GMT2021-03-15 16:05:16(Beijing Time) Xinhua English KUNMING, March 15 (Xinhua) -- Chinese scientists announced that they captured images of the sun's hot, thin and outermost layer, called the corona, with a self-developed telescopic instrument. Designed to block light from the main solar surface in order to observe the corona, the coronagraph, with a caliber of 50 mm, is positioned on a 4,800-meter-high mountain in Daocheng County of Ganzi Tibetan Autonomous Prefecture in southwest China's Sichuan Province. "Before the invention of the coronagraph, scientists could ...