Hole-y guacamole. Scientists have quantified the energy produced by the first black hole ever discovered, revealing that it spews “dancing” jets that shine as bright as thousands of suns and travel 335 million mph — half the speed of light, per an illuminating study in Nature Astronomy. “These jets are thought to be among the most energetic phenomena in the cosmos,” wrote the study’s head author Steve Prabu, a radio astronomer at the University of Oxford, in a piece for The Conversation. First