The supermassive black hole at the center of the Milky Way is unpredictable

Here, an image produced using X-ray data collected by the Swift satellite between 2006 and 2013. The supermassive black hole Sagittarius A* is in the center of the image. Low-energy X-rays — between 1,500 and 3,000 electron-volts — are shown in red, high-energy X-rays — between 3,000 and 10,000 electron-volts — in blue. © N. Degenaar, Swift, Nasa