The Milky Way's brightest dwarf satellites are distributed in a thin kinematically correlated plane (Vast Polar Structure, VPOS) roughly polar to the Galactic disk, with several dwarfs sharing similar orbital poles (Pawlowski 2015; Bullock & Boylan-Kolchin 2017; Pawlowski 2018). ΛCDM predicts roughly triaxial dispersion-supported satellite distributions; long-lived thin rotation-like planes are rare in cosmological simulations at less than 0.1% per system. Joint probability across MW + M31 + CenA + others is roughly 2 × 10⁻¹⁴.
The standard model assumes satellites accrete stochastically from a roughly isotropic CDM-substructure population. Persistent thin co-rotating planes around multiple hosts demands either filamentary infall geometry that has been ruled out by simulations, or coincidental alignment, both of which are exceedingly unlikely under standard assumptions.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, MW satellites + M31 satellites + CenA satellites + 3 other co-rotating satellite planes (joint probability 2 × 10⁻¹⁴ under ΛCDM, but 100% under SCT) are a shared-cascade-J inheritance signature. The host plus its satellites form together as cascade-debris sibling structures from the same parent cascade event, all inheriting the same parent J = μ(b × v_rel) vector at deposition (P22, P25, P31, P32).
The satellites therefore co-rotate by construction (they share the same inherited bulk J) in a thin plane (set by the cascade impact-parameter geometry's preferred direction). Sibling pockets (P58, P59, P60) provide the multi-Mpc coherence that lets the satellite system maintain its planar structure over cosmic time without needing dynamical-friction stabilization. Gravitational superposition (P50, P51, P52, P54) gives the apparent dynamical mass without invoking exotic CDM particle halos.
Universal occurrence: SCT predicts co-rotating satellite planes around ALL adequately sampled hosts, not just the few we have observed. Each host's satellite plane traces the parent cascade-event J vector at that host's formation epoch. The same M3 framework that produces galaxy spin alignments (recid 83), bulge-disk decoupling (recid 114), morphology evolution stall (recid 117), and the M31 plane (recid 131) accounts for the VPOS as a predicted cascade-inheritance signature with universal expectation rather than statistical anomaly.
If LSST + Roman + Euclid systematic survey of greater than 20 adequately sampled host galaxies finds co-rotation frequencies comparable to the ΛCDM prediction (~0.5% rather than the predicted 100%), the M3 shared-cascade-J inheritance is refuted. The signature SCT prediction is universal occurrence of co-rotating satellite planes around all sampled hosts.