When giant black holes collide,the surrounding space-time trembles

摘要

The collision of two supermassive black holes in the aftermath of a galaxy merger is the ultimatecosmic cataclysm, throwing out more energy for about an hour than all thevisible stars in the entire universe combined. Moreover, in order to form thebillions of majestic galaxies scattered across the sky, astronomers think thatsuch events must have happened frequently as the first galaxies consolidatedand grew.