Planet Nine and inclination, of objects scattered outward by Jupiter and Saturn, leaving some of them in high inclination (inc > 50°), low eccentricity orbits which have not been observed. The gravitational influence of Planet Nine would explain five peculiarities of the Solar System: While other mechanisms have been offered for many of these peculiarities, the gravitational influence of Planet Nine is the only one that explains all five. The gravity of Planet Nine also excites the inclinations of scattered disc objects, which in numerical simulations leaves the short-period comets with a broader inclination distribution than is observed. The clustering of the
Social gravity a manner "analogous in all cases, by which the center of gravity in the solar system" held the planets in their orbits. In making this analogy, Pownall's notion of 'social gravity' drew upon earlier visions of social cohesion, particularly ideas of sociability in eighteenth-century Britain. These ideas, in turn, were often predicated upon Stoic notions of cosmopolitanism, expressed by the key term oikeiôsis, in order to stress the "moral" imperative for like-minded humans to forge bonds dedicated to the common good. Social gravity Social gravity was an application of Newtonian gravity to the system of commerce influence. For instance, in