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LIGO detects second gravitational wave
Posted: Tue, Jun 21, 2016, 9:32 AM ET (1332 GMT)
A gravitational wave observatory has detected a gravitational wave from colliding black holes for the second time, physicists said June 15. The Laser Interferometer Gravitational-wave Observatory (LIGO) detected the gravitational waves on Christmas Day last year, about three months after the LIGO facilities in Louisiana and Washington made their first gravitational wave find. The newer detection came from the collision of "garden variety" black holes 14 and 7.5 times the mass of the sun. Physicists said the second detection reassures them that LIGO, which completed upgrades last year to improve its sensitivity, should be able to routinely detect gravitational waves in the future.
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