This image from NASA’s Hubble Space Telescope shows Messier 3, a densely packed cluster of stars whose origins may be a merger between globular clusters in the early universe.NASA, ESA, and A. Sarajedini (Florida Atlantic University); Processing: Gladys Kober (NASA/Catholic University of America) This image from NASA’s Hubble Space Telescope showcases Messier 3 (M3), one of the Milky Way galaxy’s most massive globular clusters, or spherical coll…