This plane nearly coincides with the so-called supergalactic plane, which includes the Virgo Cluster.
Caption: HOME This view shows the Milky Way, as well as several of the dwarf galaxies around it, relative to the supergalactic plane (circular white lines).
We can understand this motion in three dimensions relative to the supergalactic plane: Our galaxy is moving back along the X axis, sliding down the gravitational hill created by the dense collections of galaxies in the Great Attractor and the Shapley Concentration on one end, and the Dipole Repeller void on the other end.
Caption: HIDING IN PLAIN SIGHT In this all-sky view of nearby galaxies, the plane of the Milky Way (gray) is almost directly perpendicular to the supergalactic plane, which extends from left to right.
Several studies have searched for this effect in our own "supergalactic plane
," the local great wall that contains the Milky Way and the Virgo Galaxy Cluster 50 million light-years away.
A recent analysis of AGASA data suggests there is a trend, with UHECRs showing some preference for the supergalactic plane
--the midplane of a large concentration of galaxies that includes well-known clusters in Virgo, Fornax, and Perseus, as well as the Ursa Major galaxy group.