When massive objects like black holes and neutron stars merge they produce gravitational waves, which are small ripples in the fabric of spacetime
Albert Einstein predicted the existence of gravitational waves in 1916 as part of his general theory of relativity. However, scientists were not able to directly observe them until 2015—around a century later—when LIGO in the United States made a historic finding, detecting the gravitational waves produced by a pair of colliding black holes.
Since then, scientists have identified more than 50 gravitational wave signals. Until now, researchers had only confidently detected waves produced by either the collision of two black holes, or the collision of two neutron stars. But now an international collaboration of researchers has confirmed the detection of a gravitational waves produced by a third source—a black hole merging with a neutron star—according to a study published Tuesday inIn fact, the scientists detected two such events occurring just two days apart in January 2020 using LIGO and the Virgo observatory in Italy.
"Gravitational waves have allowed us to detect collisions of pairs of black holes and pairs of neutron stars, but the mixed collision of a black hole with a neutron star has been the elusive missing piece of the family picture of compact object mergers," Chase Kimball, a graduate from Northwestern University who co-authored the study, said in a press release.
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