Echoes of the past X-ray “light echoes” hint at outburst from Milky Way’s central black hole The supermassive black hole at the center of our galaxy hasn't always been quiet.

Jin concluded, “M87’s black hole features a bipolar jet stretching thousands of light-years from its core. This study offers a rare chance to further investigate the origins of these phenomena.” ...

NASA's Chandra X-ray telescope peers at a jet blasting forth from the central supermassive black hole of Centaurus A, a galaxy 12 million light-years from Earth. Credit: D. Bogensberger et al.