The Virgo Cluster is a cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo. Comprising approximately 1300 (and possibly up to 2000) member galaxies, the cluster forms the heart of the larger Virgo Supercluster, of which the Local Group is an outlying member. It is estimated that its mass is 1.2{e|1...
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http://en.wikipedia.org/wiki/Virgo_Cluster
2,500 known galaxies near the north galactic pole of the constellation Virgo that is 60 million light years from earth.
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http://planetfacts.org/space-terms/
(from the article `Cosmos`) ...with massive arms dominated by giant H II regions), they can now be used as `standard candles` to help measure the distances to irregular clusters ... It was noted earlier that the galaxies in the Virgo cluster had an average recession velocity v (as measured by their redshift) of roughly 1,000 ....
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http://www.britannica.com/eb/a-z/v/28
The nearest large cluster of galaxies and the gravitational heart of the Local Supercluster. It lies in the constellations Virgo and Coma Berenices, is centered about 50 million light-years away, and contains about 2,500 galaxies, about 150 of which are large. The Virgo Cluster completely dominates ...
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http://www.daviddarling.info/encyclopedia/V/Virgo_Cluster.html
A gigantic cluster of over 2000 galaxies that is located mainly within the constellation of Virgo. This cluster is located about 60 million light-years from Earth.
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http://www.seasky.org/astronomy/astronomy-glossary.html
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