Globular Cluster M15 from Hubble . ... Credit Copyright: ESA , Hubble , NASA Explanation: Stars, like bees, swarm around the center of bright globular cluster M15. This ball of over 100,000 stars is a relic from the early years of our Galaxy , and continues to orbit the Milky Way's center . ... This sharp image , taken by the Earth-orbiting Hubble Space Telescope , spans about 120 light years . It shows the dramatic increase in density of stars toward the cluster's center. ...