Abstract

In the history of physics, whenever there is a discrepancy between experimental observations and the predictions of a theory, to explain the discrepancy either a hitherto undiscovered additional mass is suggested to exist or it is suggested to modify the theory used for the predictions. An example for the former type is the discovery of the planet Neptune and the example for the second type is the development of Quantum Mechanics instead of Newtonian Mechanics. For the last fifty years, in the field of Astro-Physics, a discrepancy prevails between the experimentally observed dynamical parameters of an orbiting star in a galaxy and the corresponding values calculated by Newton’s Law of gravity, the former being always greater than the later. To resolve the discrepancy, a group of scientists suggested the existence of yet undiscovered matter with peculiar properties and another group of scientists suggested a modification of Newton’s law of gravity with no need to assume hidden matter. The former suggestion has come to be called Dark-Matter hypothesis and the latter as Modification of Newtonian Dynamics (MOND concept). Recently our Space Theory, using the concept of attenuation of dark energy showed how the Newtonian Law of Gravity gets modified. Using the modified expression which we have named Vethathirian Law of Gravity (VLG), we have discussed in this paper the above mentioned discrepancy for three different galaxies. It is gratifying to note that the curves given by the VLG very well compares with the experimental curves for three cases without a need for yet to be discovered dark matter.

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