Description: This ultraviolet image from the WIYN Telescope shows the collapsed-core globular cluster M15, which belongs to our Milky Way Galaxy. This bright cluster contains as many as one million stars, each of which orbits the cluster center somewhat like a bee in a swarm. M15 is one of about 150 globular clusters that orbits the center of the Milky Way Galaxy. Over a time of perhaps 10 billion years, gravitational interactions among the stars in M15 have caused its core to collapse to an extraordinarily high density state. Stellar interactions in the collapsed core have produced two X-ray binary stars and eight pulsars. The above image spans about 70 light years and shows the increase in stellar density from the halo into the collapsed core. M15 lies about 35,000 light years away toward the constellation of Pegasus. Other versions of this image are available here. (Credit: S. Slavin, H. Cohn, P. Lugger)