Two monstrous black holes are jostling for power in the same galaxy, the Chandra X-ray satellite has revealed. The pair will slam into each other in a few hundred million years, giving the fabric of space-time a good shake. “Today for the first time, thanks to the Chandra X-ray observatory’s unparalleled ability to spot black holes, we see something that is a harbinger of a cataclysmic event to come,” said a NASA official.