As kids did before Christmas, astrophysicists eagerly awaited the arrival of a catalog, which listed not toys, but horrible collisions of objects. as if a black hole – the spooky hyperlinked gravitational field left behind when the big stars collapsed. Last week, it arrived, with the help of a giant network of three gravitational detectors around the world, able to sense tiny ripples in space that began themselves as two giant black holes twisted into together. Physicists previously discovered 11 events that included the fusion of two neutron stars, which shed light on how the universe produces heavy elements. Now, the team has cataloged 37 additional black hole mergers, another neutron star fusion, and one possible merger between a black hole and neutron star. The pattern allows physicists to begin statistical analysis, which has shown that black holes are more diverse than scientists expected, provide new insights into how black holes can pair in the first place. .