The purpose of this poster is to draw attention to the recent papers of Cowsik and Ghosh (J.A.A. 7, 7, 1986 et seq. and Ap.J., 317, 26, 1987) where particles of dark matter, stars and galaxies are treated as collissionless gasses. The encounterless Boltzmann equations become coupled through the common gravitational potential in which they move. Assuming that the distributions have the Maxwellian or generalised Schwarzschild form, the potentials ϕg, ϕv due to the baryonic and dark matter are shown to satisfy the coupled equations: