Great Attractor Basin

The Great Attractor — a gravitational basin centered near the Norma cluster drawing hundreds of thousands of galaxies including the Milky Way at roughly 600 km/s — anchors what is now called the Laniakea supercluster. Its total implied mass and the coherence of its infall basin over scales of ~160 Mpc exceed what standard ΛCDM perturbation theory comfortably generates from inflationary seeds alone; the mass reconstructions push to the edge of statistical plausibility for the standard model. Successive Collision Theory identifies the Great Attractor as one of the primary collision nodes — a location where two or more filamentary compression zones generated by the original pocket collision intersect. At such nodes, the collision-front swept matter from multiple directions simultaneously, depositing mass at the intersection point far in excess of what any single linear perturbation mode could produce. Gravitational superposition of the overlapping nested comoving frames further amplifies the effective gravitational influence at the node above what the visible baryonic and even inferred dark matter mass would suggest.

The broad, shallow basin of infall that defines the Great Attractor in peculiar velocity surveys is naturally reproduced by SCT's geometry: collision-node overdensities have gravitational catchment areas that extend along the filamentary arms feeding the node, producing elongated rather than spherically symmetric potential wells. The infall velocities are set by the potential depth at the node plus the inherited angular momentum component that curves infall orbits rather than allowing purely radial collapse. This is why the Great Attractor appears as a broad attractor rather than a point-like cluster — it is the gravitational signature of a collision node integrated over the angular momentum distribution of infalling material rather than a simple concentration of virially bound mass.