![]() ![]() The previous two sightings of gravitational waves were also produced by black-hole mergers, but LIGO researchers think this is the first event in which the spin of one of the merging black holes could have been pointing in the opposite direction to the orbital rotation of the black holes. One black hole was 31 times more massive than the Sun and the other weighed in at 19 solar masses. The wave was produced by two black holes that merged about 3 billion light-years from Earth. (Courtesy: Tushna Commissariat)Ī third gravitational wave has been detected by physicists working on the LIGO gravitational-wave detectors in the US.
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