"The Biggest Mystery in Astrophysics Today" --Flashes from an Unknown Source Far Beyond the Milky Way (Today's "Galaxy" Stream)

Perhaps the source "is a dwarf galaxy that contains a supermassive black hole, or is the nucleus of a disrupted galaxy or even just an isolated black hole," Heino Falcke, a radio astronomer and astroparticle physicist at Radboud University Nijmegen...