Hubble Image of Messier 9 (IMAGE) ESA/Hubble Information Centre Caption This image from the NASA/ESA Hubble Space Telescope shows the globular cluster Messier 9. Hubble's image resolves stars right into the center of the cluster, and clearly shows they have different colors. Redder colors signify lower surface temperatures, while blue stars are extremely hot. Credit NASA & ESA 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.