The Great Attractor is a gravitational anomaly: a large-scale bulk flow of galaxies toward a region 150 to 250 Mly away in the Centaurus-Norma supercluster direction. The inferred mass concentration required to produce the observed 600 km/s bulk flow exceeds what visible matter and standard dark-matter distributions account for in that region (Kashlinsky 2010; Feldman 2010). The basin of attraction is too large and too powerful for simple hierarchical structure formation.
The standard model attributes the Great Attractor to a CDM-dominated supercluster mass concentration plus standard local-attraction physics. The observed mass deficit (visible matter + standard DM < required mass) demands either an exotic concentration of CDM or unaccounted-for systematics in mass surveys. Neither is parsimonious within minimal ΛCDM.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, the Great Attractor's gravitational pull is sourced by Φ_eff = Φ_local + Φ_mesh (P50, P51), with the coherent Φ_mesh contribution providing the extra effective mass beyond what visible matter accounts for. In fully virialized halo regions, A* = 5.970 (P52, parameter-free from 1/f_b in Paper 13) gives the observed mass-to-visible-mass ratio without invoking exotic CDM concentrations.
Angular-momentum inheritance (P31, P32) places the Great Attractor at a cascade-stream convergence node where multiple filaments meet (P34). This is exactly the kind of high-mass node the cascade impact-parameter distribution P(b) ∝ b deposits at cluster-scale intersections (recid 74 connectivity statistics). Sibling-pocket gravitational coupling at 1 to 2 Gpc separations (P58, P59, P60) adds gigaparsec-scale contributions to the basin attraction.
The Great Attractor and the Centaurus-Vela bulk flow (recid 87) are observational projections of the same cascade-J signature: the bulk flow toward the Attractor reflects our patch's residual frame velocity (P63) plus the gravitational-attraction component from the cascade-deposited high-mass node. Structure without dark-matter particles (P54) is the keystone: the Great Attractor mass anomaly is the Φ_mesh contribution that ΛCDM omits, not exotic CDM concentration. There is no need for unaccounted-for systematics in mass surveys.
If precision Euclid + DESI + Roman mass-mapping of the Great Attractor region finds the inferred mass concentration consistent with standard CDM-distributed dark matter at the 5% level (no Φ_mesh excess beyond the visible-matter plus standard-DM prediction), the M6 coherent-mesh-attraction explanation is refuted. The signature SCT prediction is that the basin mass exceeds visible-matter expectations by exactly the A* = 5.970 factor in the virialized core.