Newly Discovered Black-Hole Pairs (IMAGE) California Institute of Technology Caption Three of the newly discovered black-hole pairs. On the left are images from the Sloan Digital Sky Survey. The images on the right show the same galaxies taken with the Keck telescope and the aid of adaptive optics, revealing pairs of active galactic nuclei, which are powered by massive black holes. Credit S. George Djorgovski 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.