Both of the twin Laser Interferometer Gravitational-Wave Observatory (LIGO) detectors—located in Livingston, Louisiana, and Hanford, Washington—detected the gravitational wave event, named GW151226. The LIGO Scientific Collaboration (LSC) and the Virgo Collaboration used data from the twin LIGO detectors to make the discovery, which is accepted for publication in the journal Physical Review Letters.

Gravitational waves carry information about their origins and about the nature of gravity that cannot otherwise be obtained. Physicists on the LIGO and Virgo teams concluded that the final moments of a black hole merger produced the gravitational waves observed on December 26, 2015.

LIGO’s historic first detection on September 14, 2015 resulted from a merger of two black holes 36 and 29 times the mass of the sun. In contrast, the black holes that created the second event were relative flyweights, tipping the scales at 14 and eight times the mass of the sun. Their merger produced a single, more massive spinning black hole that is 21 times the mass of the sun, and transformed an additional sun’s worth of mass into gravitational energy.

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