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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.
See also
Large-scale structure of the cosmos, Extragalactic astronomy