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It is surprising that we hardly know only 5% of the universe. Rest of theuniverse is made up of 70% of dark-energy and 25% of dark-matter. Dark-energyis responsible for acceleration of the expanding universe; whereas dark-matteris said to be necessary as extra-mass of bizarre-properties to explain theanomalous rotational-velocity of galaxy. Though the existence of dark-energyhas gradually been accepted in scientific community, but the candidates fordark-matter have not been found as yet and are too crazy to be accepted. Thus,it is obvious to look for an alternative theory in place of dark-matter.Israel-scientist M. Milgrom has suggested a 'Modified Newtonian Dynamics(MOND)' which appears to be highly successful for explaining the anomalousrotational-velocity. But unfortunately MOND lacks theoretical support. TheMOND, in-fact, is (empirical) modification of Newtonian-Dynamics throughmodification in the kinematical acceleration term 'a' (which is normally takenas $a=\frac{v^{2}}{r}$) as effective kinematic acceleration $a_{effective} = a\mu (\frac{a}{a_{0}})$, wherein the $\mu$-function is 1 for usual-values ofaccelerations but equals to $\frac{a}{a_{0}} (\ll 1)$ if the acceleration 'a'is extremely-low lower than a critical value $a_0 (10^{-10} m/s^{2})$. In thepresent paper, a novel variant of MOND is proposed with theoretical backing;wherein with the consideration of universe's acceleration $a_{d}$ due todark-energy, a new type of $\mu$-function on theoretical-basis emerges outleading to $a_{effective} = a(1 - K \frac{a_{0}}{a})$. The proposedtheoretical-MOND model too is able to fairly explain qualitatively themore-or-less 'flat' velocity-curve of galaxy-rotation, and is also able topredict a dip (minimum) on the curve.

A theoretically-explained new-variant of Modified-Newtonian-Dynamics (MOND)