  Modified Newtonian dynamics (MOND) is a hypothesized modification of Newton's
law of universal gravitation to account for the flat rotation curves in the
outer regions of galaxies, thereby eliminating the need for dark matter.
Although a highly successful model, it is not a self-contained physical theory
since it is based entirely on observations. It is proposed in this paper that
noncommutative geometry, an offshoot of string theory, can account for the flat
rotation curves and thereby provide a justification for MOND. This paper
extends an earlier heuristic argument by the author.
