Black Hole Cluster (IMAGE) Northwestern University Caption This illustration generated by a computer model shows multiple black holes found within the heart of a dense globular star cluster. Credit Aaron M. Geller, Northwestern University/CIERA Usage Restrictions Credit must be given 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.