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Part II
Rotation is observed at essentially every physical scale that has been measured, from planets to galaxy clusters to cosmic-web filaments. BFUT Papers 1 and 9 establish that matter accumulation from multiple directions under gravity, with no rigid outer boundary to absorb the resulting angular momentum, is the general mechanism producing this pattern, the same gravitational sorting already confirmed directly in the solar system's own settling into a single rotating, coplanar arrangement, so rotation is the expected outcome of gravitational accretion at any scale, not a coincidence recurring independently at each one [P1, P9].
Source papers: P1, P9