Lagrange points, also known as the Lagrangian points, are points in space where the gravitational forces of two large bodies balance the centrifugal force felt by a smaller object. There are five Lagrange points in the Earth-Moon system, designated L1 through L5. Synonyms for Lagrange points include Lagrangian equilibrium points, libration points, and gravitational equilibrium points. Lagrange points are important in space exploration, as they provide stable places for spacecraft to orbit without expending fuel to stay in position. They are also useful for studying the dynamics of celestial bodies and for locating space telescopes.