Editing Supercluster (section)

{{short description|Large group of smaller galaxy clusters or galaxy groups}}
[[File:Superclusters atlasoftheuniverse.gif|alt=|thumb|A map of the superclusters and [[void (astronomy)|voids]] nearest to Earth|300x300px]]

A '''supercluster''' is a large group of smaller [[galaxy cluster]]s or [[galaxy group]]s;<ref name=":1">{{cite web |url=http://www.universetoday.com/30286/local-group/ |title=Local Group |last=Cain |first=Fraser |date=4 May 2009 |work=[[Universe Today]] |access-date=6 December 2015}}</ref> they are among the largest known structures in the [[universe]]. The [[Milky Way]] is part of the [[Local Group]] galaxy group (which contains more than 54 galaxies), which in turn is part of the [[Virgo Supercluster]], which is part of the [[Laniakea Supercluster]], which is part of the [[Pisces–Cetus Supercluster Complex]].<ref name=":02">{{Cite journal |last=Gibney |first=Elizabeth |date=2014-09-03 |title=Earth's new address: 'Solar System, Milky Way, Laniakea' |url=https://www.nature.com/articles/nature.2014.15819 |journal=Nature |language=en |doi=10.1038/nature.2014.15819 |s2cid=124323774 |issn=1476-4687|url-access=subscription }}</ref> The large size and low density of superclusters means that they, unlike clusters, expand with the [[Hubble expansion]]. The number of superclusters in the [[observable universe]] is estimated to be 10 million.<ref>{{cite web |url=http://www.atlasoftheuniverse.com/universe.html |title=The Universe within 14 billion Light Years |work=Atlas of the Universe |access-date=6 December 2015}}</ref>