Supermassive Black Holes en Route to Cataclysmic Collision: Doomed Pair Closer Than Ever Observed

NASA’s retired Compton mission data reveals the brief existence of a superheavy neutron star shortly before it collapsed into a black hole — This fleeting, massive object likely formed from the collision of two neutron stars

Two supermassive black holes, very close together, found by astronomers - CNN

Hungry black holes trapped in an intimate dance feast on leftovers from a galactic merger