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Lagrange stability (of motion) is a criteria for a stability of a trajectory within a dynamical system (such as a planet in orbit), the criteria consisting of a set of inequalities. Trajectories that satisfy them belong to stable orbits, i.e., orbits that will remain for a very long time. The quantities involved are regarding two objects orbiting a third, the aim being to determine whether the gravitational force between the orbiting objects will predictably terminate an object's orbit.