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Modified Newtonian Dynamics (MOND) provides a successful description ofstellar and galactic dynamics on almost all astronomical scales. A key featureof MOND is the transition function from Newtonian to modified dynamics whichcorresponds to the empirical mass discrepancy--acceleration (MDA) relation.However, the functional form of the MDA relation does not follow from theory ina straightforward manner; in general, empirical MDA relations are inserted adhoc into analyses of stellar dynamics. I revisit the possibility of gravitybeing mediated by massive virtual particles, gravitons. Under certainreasonable assumptions, the resulting "graviton picture" implies a MDA relationthat is equivalent to the - empirical - "simple mu" function of MOND which isin very good agreement with observations. I conclude that the "gravitonpicture" offers a simple description of gravitation on galactic scales,potentially playing a role for gravitation analogous to the role played byBohr's model for atomic physics.

The "Graviton Picture": a Bohr Model for Gravitation on Galactic Scales?