What is Galaxy group?
A '''galaxy group''' is a group of [[Galaxy|galaxies]] made up of less than 50 or so members and bound by [[gravity]]. Collections of galaxies larger than groups are called [[galaxy clusters]] or [[supercluster]]s. Our own galaxy, the [[Milky Way]], is in the [[Local Group]] of more than 40 galaxies.<ref>{{cite web|title=The Local Group|url=http://www.ast.cam.ac.uk/~mike/local_more.html|author=Mike Irwin|accessdate=2009-11-07|archive-date=2019-06-19|archive-url=https://web.archive.org/web/20190619131606/https://www.ast.cam.ac.uk/~mike/local_more.html|url-status=dead}}</ref> Galaxy groups are the smallest groups of galaxies. They usually have no more than 50 galaxies. The group in a diameter of 1 to 2 mega[[parsecs]] (about 4 to 8 million [[light-years]]). Their mass is about 10<sup>13</sup> [[solar mass]]es. This is just a guide, because larger and more massive galaxy systems are sometimes called galaxy groups.<ref>{{cite web|url=http://csep10.phys.utk.edu/astr162/lect/gclusters/groups.html|title=Groups of Galaxies|publisher=University of Tennessee, Knoville|author=UTK Physics Dept|accessdate=September 27, 2012}}</ref> == References == {{reflist}} {{science-stub}} [[Category:Galaxy clusters]]