\oint_{\partial\mathcal{V}} \mathbf{g}\cdot d\mathbf{A}= -4\pi GM
where \mathbf{g} is the gravitational field, d\mathbf{A} is a differential, oriented piece of area, G is the gravitational constant and M is the mass comprised by the volume described by the surface \partial V.
This is going to be so cool!
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