PHENOMENOLOGICAL SCALING LAWS RELATING THE OBSERVED GALACTIC DIMENSIONS TO THE MICROSCOPIC FUNDAMENTAL SCALES

It is shown that the order of magnitude of the characteristic observed radii of typical galaxies can be inferred from the microscopic fundamental scales through a phenomenological scaling law. Further scaling relations are derived, which show that such a connection can equivalently be obtained either by considering the nucleons as the elementary constituents of a galaxy, or, as more common, by considering stars as its granular components.