After more than four years of exploring a menagerie of cosmic happenings through gravitational waves, scientists have finally spotted the third expected variety of collision — twice.

The new flavor of collision includes one black hole and one neutron star, making it a mash-up of sorts. Scientists have observed dozens of mergers of pairs of black holes, and a couple mergers of pairs of neutron stars, the superdense stellar corpses. But a crash between a black hole and neutron star, while predicted by scientists, had not been definitively detected. 



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