Editing Virgo Supercluster (section)

==Galaxy distribution==
The [[number density]] of galaxies in the LS falls off with the square of the distance from its center near the [[Virgo Cluster]], suggesting that this cluster is not randomly located. Overall, the vast majority of the luminous galaxies (less than [[absolute magnitude]] −13) are concentrated in a small number of [[Galaxy cloud|clouds]] (groups of [[galaxy cluster]]s). Ninety-eight percent can be found in the following 11 clouds, given in decreasing order of number of luminous galaxies: [[M94 Group#Canes Venatici Cloud|Canes Venatici]], Virgo Cluster, [[Virgo II Groups|Virgo II]] (southern extension), [[Leo II Groups|Leo II]], [[Virgo III Groups|Virgo III]], Crater ([[NGC 3672]]), [[M96 Group|Leo I]], Leo Minor ([[NGC 2841]]), Draco ([[NGC 5907]]), Antlia ([[NGC 2997]]), and [[NGC 5643]].<ref name="tully82" />

Of the luminous galaxies located in the disk, one third are in the Virgo Cluster, with the other two thirds located outside of the cluster.<ref name="tully82" />

The luminous galaxies in the halo are concentrated in a small number of clouds (94% in 7 clouds). This distribution indicates that "most of the volume of the supergalactic plane is a great void."<ref name="tully82" /> A helpful analogy that matches the observed distribution is that of soap bubbles. Flattish clusters and [[superclusters]] are found at the intersection of bubbles, which are large, roughly spherical (on the order of 20–60 [[Parsec|Mpc]] in diameter) voids in space.<ref name="ma96">
{{cite book
 | author = Carroll, Bradley
 | author2 = Ostlie, Dale
 | title = An Introduction to Modern Astrophysics
 | publisher = [[Addison-Wesley]]
 | date = 1996
 | location = New York
 | page = 1136
 | isbn = 0-201-54730-9
}}</ref> Long filamentary structures seem to predominate. An example of this is the [[Hydra–Centaurus Supercluster]], the nearest supercluster to the Virgo Supercluster, which starts at a distance of roughly 30 Mpc and extends to 60 Mpc.<ref name="fairall89">
{{cite journal
 | last1 = Fairall | first1 = A. P.
 | last2 = Vettolani | first2 = G.
 | last3 = Chincarini | first3 = G.
 | title = A wide angle redshift survey of the Hydra-Centaurus region
 | journal = Astronomy and Astrophysics Supplement Series
 | date = May 1989
 | volume = 78
 | issue = 2
 | page = 270
 | bibcode = 1989A&AS...78..269F
 | issn=0365-0138
}}</ref>