The gravitational waves from both collisions were detected by the National Science Foundation’s Laser Interferometer Gravitational-Wave Observatory (LIGO) in the United States, and by Virgo in Italy. The events are named GW200105 and GW200115, for the date when each gravitational wave was observed. Both signals represent the final moments as a black hole and a neutron star spiraled in and merged together. For GW200105, the black hole is estimated to be about 9 times the mass of the sun, with a companion neutron star of about 1.9 solar masses. The the two objects are estimated to have merged around 900 million years ago. GW200115 is the product of a 6-solar-mass black hole, which collided with a neutron star about 1.5 times the mass of our sun, around 1 billion years ago. In both events, the black holes were large enough that they likely devoured their neutron stars completely, leaving very little to no light in their aftermath.
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