Mechanisms of aggregation of physical systems: Possible universal laws

In this paper we deduce, by general hypotheses, phenomenological relations which allow to compute in order of magnitude, but with sensible accuracy, the sizes of all the observed astrophysical and cosmological structures in terms of two microscopic quantities (the radius and the mass of a nucleon), and of two fundamental constants (the gravitational constant and the velocity of the light). Moreover, we show that similar phenomenological relations could rule the mechanisms of aggregations of a large class of physical systems.