Paul Weissman

In 1979 American astronomer Paul Weissman (the author of this article) published computer simulations of the Oort cloud energy distribution using planetary perturbations by Jupiter and Saturn and physical models of loss mechanisms such as random disruption and formation of a nonvolatile crust, based on actual observations of comets.…

…piles,” proposed by American astronomer Paul Weissman (the author of this article) in 1986, with low binding strength and high porosity. Key data supporting these models are estimates of nucleus bulk density, ranging from 0.2 to 1.0 gram per cubic centimetre, with preferred values of about 0.3–0.6 gram per cubic…