The Virgo Supercluster
or Local Supercluster
is the supercluster
that contains the Local Group
and with it our galaxy, the Milky Way
. It has a pancake like shape of a flattened disk, with a diameter of about 200 million
light years. It contains about 100 groups and clusters of galaxies
and is dominated by the Virgo cluster
near its center. The Local Group is located near the edge and is drawn towards the Virgo cluster.
By tracking its gravitational effect on the movement of galaxies, one can estimate that the total mass of the Virgo Supercluster is about 1015 solar masses. As its luminosity is far too small for this number of stars, it is thought that a large part of its mass is dark matter.
A gravitational anomaly known as the Great Attractor lies somewhere within the local group.
Large-scale structure of the cosmos, Extragalactic astronomy