Laniakea Supercluster

The Laniakea Supercluster (considered the Local Supercluster) is a supercluster with 300-500 galaxy clusters, with 100,000 galaxies including the Milky Way, stretched out over 160 megaparsecs, with a mass of about 10¹⁷ solar masses. It was defined as such in September 2014 based upon a study of the velocities of the galaxies. It combines four groups traditionally labeled superclusters:

• Virgo Supercluster, which was traditionally considered the Local Supercluster.
• Hydra-Centaurus Supercluster which includes the Great Attractor.
• Pavo-Indus Supercluster.
• Southern Supercluster.

A study has suggested it is not gravitationally bound, in which case it is a matter of nomenclature whether it should be termed a supercluster.