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The self-binding energy and stability of a galaxy in MOND-based gravity arecuriously decreasing functions of its center of mass acceleration towardsneighbouring mass concentrations. A tentative indication of this breaking ofthe Strong Equivalence Principle in field galaxies is the RAVE-observed escapespeed in the Milky Way. Another consequence is that satellites of fieldgalaxies will move on nearly Keplerian orbits at large radii (100 - 500 kpc),with a declining speed below the asymptotically constant naive MOND prediction.But consequences of an environment-sensitive gravity are even more severe inclusters, where member galaxies accelerate fast: no more Dark-Halo-likepotential is present to support galaxies, meaning that extended axisymmetricdisks of gas and stars are likely unstable. These predicted reappearance ofasymptotic Keplerian velocity curves and disappearance of "stereotypicgalaxies" in clusters are falsifiable with targeted surveys.

Loss of mass and stability of galaxies in MOND