The smallest aggregates of galaxies are called groups. These typically consist of fewer than 50 galaxies, and have diameters ~ 2 Mpc. Our Milky Way is part of a group we call The Local Group, which also includes another large spiral M31 (Andromeda), one small spiral, many smaller irregulars and a few dwarf ellipticals, totaling about 30 galaxies in all. There may be more irregular and dwarf ellipticals. The Local Group is about 1 Mpc across with the two large spirals, the Milky Way and Andromeda Galaxy, dominating the two ends (although the below picture shows the Milky Way at the center). Each large spiral has several of the smaller galaxies orbiting them. The Local Group's content is quite typical, although there are no large ellipticals - these are less common than spirals, but more often found in larger assemblages called clusters.