• synonyms

Local Group

noun Astronomy.
  1. the group of galaxies, at least 25 of which are known, that includes the Milky Way.
Show More

Origin of Local Group

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for local group

Local Group

  1. astronomy the cluster of galaxies to which our galaxy and the Andromeda Galaxy belong
Show More
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

local group in Science

Local Group

  1. A group of more than 30 galaxies that includes 2 large spiral galaxies-the Milky Way and Andromeda-as well as numerous smaller galaxies, many of which are dwarfs. The Local Group has a diameter of approximately 10 million light-years, with its gravitational center located between our galaxy and the Andromeda galaxy. It is part of a larger grouping known as the Virgo supercluster.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.