The Laniakea Supercluster (Laniakea; also called Local Supercluster or Local SCl) is the galaxy supercluster that is home to our galaxy the Milky Way, and 100,000 other nearby galaxies. It was defined in September 2014, when a group of astronomers including R. Brent Tully of the University of Hawaii and Hélène Courtois of the University of Lyon published a new way of defining superclusters according to the relative velocities of galaxies. The new definition of the local supercluster subsumes the prior defined local supercluster, the Virgo Supercluster, now an appendage.