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FAST Finds a Pulsar in an Almost Flawless Circular Orbit
Somewhere in the plane of the Milky Way, a dead star is spinning 220 times a second, and it's circling its companion in almost the most perfect orbit astronomers have ever measured. China's giant FAST radio telescope has just found it, and the shape of that orbit is a near flawless record of a billion year relationship between two stars.
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