Astronomers detect ‘cosmic bass note’ of gravitational waves

Sound comes from the merging of supermassive black holes across the universe, according to scientists

Astronomers have detected a rumbling cosmic bass note" of gravitational waves thought to be produced by the slow-motion mergers of supermassive black holes across the universe.

The observations are the first detections of low-frequency ripples in the fabric of spacetime and promise to open a new window on the monster black holes lying at the centres of galaxies.