... M81: Feeding a Black Hole . ... Credit Copyright: X-ray: NASA/CXC/Wisconsin/D.Pooley CfA/A.Zezas; . ... IR: NASA/JPL-Caltech/CfA Explanation: This impressive color composite shows spiral galaxy M81 across the electromagnetic spectrum. ... The inset highlights X-rays from some of M81's black holes, including black holes in binary star systems with about 10 times the mass of the sun, as well as the central, supermassive black hole of over 70 million solar masses . ... Across the Center of Centaurus A ...