Darkest things combine for light

摘要

Two of the darkest things in the universe may be making light -or at least, radiation. When jets spat out by a supermassive black hole at the centre of a galaxy collide with dark matter, they could produce gamma rays detectable from Earth - possible evidence of the elusive dark stuffrnJets of particles are propelled away from black holes at near th( speed of light. Akin to a cosmic belch, they are thought to be connected with matter falling into the black hole. Stefano Profumo of the University of California, Santa Cruz, and his colleagues calculated how electrons in one of these jets would interact with any surrounding dark matter.