The black hole always chirps twice: New clues deciphering the shape of black holes

(The Australian Research Council Centre of Excellence for Gravitational Wave Discovery) A team of gravitational-wave scientists led by the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) reveal that when two black holes collide and merge, the remnant black hole 'chirps' not once, but multiple times, emitting gravitational waves--intense ripples in the fabric space and time--that inform us about its shape. Today the study has been published in Communications Physics (from the p...