Editing CfA2 Great Wall (section)

==Components==
[[File:Nearsc.gif|thumb|400px|The Great Wall includes clusters Hercules, Coma and Leo on the right of this view of the local universe.]]
It was discovered in 1989 by [[Margaret Geller]] and [[John Huchra]] based on [[redshift survey]] data from the [[CfA Redshift Survey]].<ref>{{Cite journal
| doi = 10.1126/science.246.4932.897
| volume = 246
| issue = 4932
| pages = 897–903
| last = Geller
| first = Margaret J.
|author2=John P. Huchra
| title = Mapping the Universe
| journal = Science
| access-date = 2011-05-03
| date = 1989-11-17
| url = https://www.science.org/doi/abs/10.1126/science.246.4932.897
|bibcode = 1989Sci...246..897G
| pmid=17812575| s2cid = 31328798
| url-access = subscription
}}</ref>

It is not known how much further the wall extends due to the light absorption in the plane of the [[Milky Way]] [[galaxy]] where Earth is located. The [[Interstellar medium|gas and dust]] from the Milky Way (known as the [[Zone of Avoidance]]) obscure the view of astronomers and have so far made it impossible to determine if the wall ends or continues on further than they can currently observe.

In the [[Lambda-CDM model|standard model]] of the evolution of the universe, such structures as the Great Wall form along and follow [[Galaxy filament|web-like strings]] of [[dark matter]].<ref>{{Cite book
| publisher = W H Freeman & Co (Sd)
| isbn = 978-0-7167-2157-4
|author1-link=Michael Riordan (physicist)
| last = Riordan
| first = Michael
| author2 = David N. Schramm |author2-link=David Schramm (astrophysicist)
| title = Shadows of Creation: Dark Matter and the Structure of the Universe
| date = 1991
| url-access = registration
| url = https://archive.org/details/shadowsofcreatio0000rior
}}</ref> It is thought that this dark matter dictates the structure of the Universe on the grandest of scales. Dark matter gravitationally attracts [[baryon]]ic matter, and it is this "normal" matter that astronomers see forming long, thin walls of super-galactic clusters.