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Then I struck me that perhaps a revised equation of gravity (Newton's inverse square law) might be able to also explain the observed "adhesion" within the galaxies. Here is the idea:

- The force of gravity, F.g, which is holding galaxies together is stronger than Newton's equation (F.g=G*M1*M2/r^2) but only over large distances, when r is of the magnitude of galaxies. So, 1/r^2 term would be replaced by some polynomial that doesn't deminish at the same rate as 1/r^2, such as [C/r + 1/r^2] where C is a constant.

- The centrifugal force, F.cf, which is trying to fling the galactic stars out of their orbits, remains the same, as per classical mechanics, F.cf = d(M1*V)/dt

- The centripetal force, F.cp, which matches gravitation force would remain the same, as per classical mechanics, F.cp = M1*V^2/r.

OK, please critique my conjecture.