New gravitational wave hits Earth — For the first time, 3 detectors zoom in on location

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For the first time, three detectors have tracked the gravitational waves emitted by a merger of two black holes — a critical new capability that allows scientists to more closely locate a gravitational wave’s birthplace in space. It is the fourth announced detection of a binary black-hole system by the LIGO detectors and the first significant gravitational-wave signal recorded by the Virgo detector.