Same black hole can collide with its kin multiple times, lopsided merger suggests
Words by Meghan Bartels
For black holes, a collision doesn’t have to be a oncein-a-lifetime experience. On 12 April 2019, scientists detected a new black hole merger using a trio of gravitational-wave detectors. Astrophysicists have spotted such events before, but something about the signals was different: the two black holes that collided were incredibly unevenly matched, with the larger about three times the size of the smaller.