Einsteins static model is the first relativistic cosmological model. The model is static, finite and of spherical spatial symmetry. I use the solution of Einsteins field equations in a homogeneous and isotropic universe -- Friedmanns equation -- to calculate the radius of curvature of the model (also known as Einsteins universe). Furthermore, I show, using a Newtonian analogy, the models mostly known feature, namely, its instability under small perturbations on the state of equilibrium.
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