Lagrange Point

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A Lagrange point is a point in space around two orbiting bodies where another small body can remain at a relatively fixed orbit between the other two bodies. The forces of gravity due to those larger bodies at the point are equal, and they will provide the exact amount of centripetal force allowing the small body to rotate with them.

When any two large objects in an orbital configuration exist, there will be five Lagrange points, referred to as L1 through L5.