Sagittarius A* (IMAGE) Penn State Caption This artist's illustration shows a cross-section of Sagittarius A*, the supermassive black hole near the center of our Milky Way galaxy. Researchers, led by Ruth Daly at Penn State, determined that the black hole is spinning at about 60% of its potential speed. Credit NASA/CXC/M. Weiss Usage Restrictions Must be credited License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.