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GW170817 was a gravitational wave (GW) observed by the LIGO and Virgo detectors on 17 August 2017, originating from the shell elliptical galaxy NGC 4993, about 144 million light years away.
Petteri Johannes Koponen (born 13 April 1988) is a Finnish professional basketball coach and former player who is the head coach of the New Zealand Breakers in the Australian National Basketball League (NBL).