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This paper describes how the non-gravitational contribution to galactic velocity ro-tation curves can be explained in terms of a Cosmological Constant (A). The velocity rotation curve for the nearby galaxy M33 will be analysed in detail while several other galaxies will be superficially studied. It will be shown that the Cosmological Constant leads to a contribution to the acceleration proportional to the radii, at large radii, and depending on the mass of the galaxy. This explanation contrasts with the usual interpretation of this effect due to Dark Matter halos.
The experimental and theoretical results presented in this paper support recent evidence suggesting that the Universe is accelerating. It will be shown that the Cosmological Constant, in the Weak Field Approximation, leads to a correction term for the Newtonian potential and the corresponding acceleration of a test particle.
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