Thus, if a spherically symmetric body has a uniform core and a uniform mantle with a density that is less than $$\mathrm{\frac{2}{3}}$$ of that of the core, then the gravity initially decreases outwardly beyond the boundary, and if the sphere is large enough, further outward the gravity increases again, and eventually it exceeds the gravity at the core/mantle boundary. So, the gravitational force acting upon point mass mm is: where it can be shown that \(\mathrm{M_{