The Local Group is the group of galaxies that includes Earth's galaxy, the Milky Way. The group comprises more than 54 galaxies (including dwarf galaxies), with its gravitational center located somewhere between the Milky Way and the Andromeda Galaxy. The galaxies of the Local Group cover a diameter of 10 megalight-years (3.1 megaparsecs) (see 1 E+22 m for distance comparisons) and have a binary (dumbbell) distribution. The group is estimated to have a total mass of 1.29±0.14 ×1012 M☉ and has a velocity dispersion of 61±8 km/s. The group itself is part of the Virgo Supercluster (i.e. the Local Supercluster).
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Some articles on local group:
... In addition to slowing the overall expansion, gravity causes local clumping of matter into stars and galaxies ... Within our Local Group of galaxies, the gravitational interactions have changed the inertial patterns of objects such that there is no cosmological expansion taking place ... Once one goes beyond the local group, the inertial expansion is measurable, though systematic gravitational effects imply that larger and larger parts of space will eventually ...
... to Maffei 1 at about 1 Mpc, which would place it within the Local Group of galaxies ... That distance puts Maffei 1 well outside the Local Group, but close enough to have influenced it in the past ... the past 20 years would imply that Maffei 1 has never been close enough to the Local Group to significantly influence its dynamics ...
... The married man can live, most commonly, in his father's local group or in his father-in-law's local group ... The hearth group, "kakah", is the smallest unit of production and consumption, and can be made up of a nuclear family it may also include additional persons (mothers-in-law ... There is no ideal group size, and numbers vary enormously between one local group and another ...
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