Messier 13 or M13, is a globular cluster of several hundred thousand stars in the constellation of Hercules. This great globular cluster in Hercules, was discovered by Edmond Halley in 1714, and cataloged by Charles Messier on June 1, 1764. With an apparent visual magnitude of 5.8, M13 is 22,200–25,000 light-years away from Earth, and the globular cluster is one of over one hundred that orbit the center of our galaxy, the Milky Way.