From Space.com:
In a highly anticipated announcement today (Feb. 11), researchers affiliated with the Laser Interferometer Gravitational-Wave Observatory (LIGO) reported the detection of gravitational waves. The signal picked up by LIGO came from the collision of two black holes and was detected on Sept. 14, 2015 by LIGO’s twin detectors in Livingston, Louisiana and Hanford, Washington, scientists said. – See more at: http://www.space.com/31900-gravitational-waves-discovery-ligo.html#sthash.nVWft1Wz.dpuf