Local Group of galaxies, including the massive members Messier 31 (Andromeda Galaxy) and Milky Way, as well as other nearby galaxies.
Distribution of the iron content (in logarithmic scale) in four dwarf neighbouring galaxies of the Milky Way
The Local Group is the galaxy group that includes the Milky Way. It has a total diameter of roughly 3 Mpc (or 10 Mly ≈ 1023 m), and a total mass of the order of 2×1012solar masses (4×1042 kg).It consists of two clusters of galaxies in a "dumbbell" shape, the Milky Way and its satellites on one hand, and the Andromeda Galaxy and its satellites on the other. The two clusters are separated by about 0.8 Mpc and move towards one another with a velocity of 123 km/h. The group itself is a part of the larger Virgo Supercluster, which may be a part of the Laniakea Supercluster.The total number of galaxies in the Local Group is unknown (due to its partial occlusion by the Milky Way) but known to exceed 54, most of them beingdwarf galaxies.
The Triangulum Galaxy is the third largest member of the Local Group, at about 5×1010M☉, and the third spiral galaxy. It may or may not be a companion to the Andromeda Galaxy. Pisces Dwarf Galaxy is equidistant from the Andromeda Galaxy and the Triangulum Galaxy, so it may be a satellite of either.