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A Lagrangian point (or L-point) is one of five positions in space where the gravitational field of two bodies of substantial mass interact to form a point at which a third body of negligible mass can be positioned stably. Bodies at the L-point will not move relative to the parent bodies if they are not perturbed by other gravitational forces. They are sometimes also referred to as libration points.
A Lagrangian point (or L-point) is one of five positions in space where the gravitational field of two bodies of substantial but differing mass interact to form a point at which a third body of negligible mass can be positioned stably. Bodies at the L-point will not move relative to the parent bodies if they are not perturbed by other gravitational forces. They are sometimes also referred to as libration points.