Mayall II is a globular cluster orbiting the Andromeda Galaxy (Messier 31). Also known as Andromeda’s Cluster and Globular One (G1), it is the most intrinsically bright globular cluster in the Local Group of galaxies, with an absolute visual magnitude of -10.94 and a luminosity of 2 million Suns. The cluster has an apparent magnitude… Read More »Mayall II
