16 October 2017
One is rapid and strong, and the other is slow and weak, like the heartbeats of a youth and an old man passing through a distance of thousands of light years, and then heard by the most sensitive "ear" on Earth. The "ear" is the Five-hundred-meter Aperture Spherical Telescope (FAST), the world's largest radio telescope, with a dish as large as 30 football fields. It is located in a valley deep in southwest China's mountainous Guizhou Province.
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