NGC 1600 (IMAGE) ESA/Hubble Information Centre Caption The elliptical galaxy NGC 1600, 200 million light-years away -- shown in the center of the image and highlighted in the box --, hosts in its center one of the biggest supermassive black holes known . Until the discovery of this example, astronomers assumed that such huge black holes could only be found in the centers of massive galaxies at the center of galaxy clusters. NGC 1600, however, is a rather isolated galaxy. The image is a composition of a ground based view and observations made with the NASA/ESA Hubble Space Telescope. Credit NASA, ESA, Digital Sky Survey 2 Usage Restrictions None 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.