The Phoenix Cluster (image) University of Chicago Caption The Phoenix Cluster, shown here as it appears in microwave (orange), optical (red, green, and blue) and ultraviolet (blue) wavelengths, is forming stars at the highest rate ever observed for the middle of a galaxy cluster. The Phoenix Cluster was discovered by a collaboration of astronomers from the University of Chicago's Kavli Institute for Cosmological Physics and elsewhere. Credit South Pole Telescope collaboration Usage Restrictions News organizations may use this image to illustrate reports about the discovery of the Phoenix galaxy cluster. 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.