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List of Mil Mi-8/17 operators. The following nations currently operate (or formerly owned) Mi-8 and Mi-17 helicopters in civil or military roles:
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GW170817 was a gravitational wave (GW) signal observed by the LIGO and Virgo detectors on 17 August 2017, originating from the shell elliptical galaxy NGC 4993, about 140 million light years away. The signal was produced by the last moments of the inspiral process of a binary pair of neutron stars, ending with their merger.