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In physics, an orbit is the gravitationally curved trajectory of an object.[1] In astronomy, orbits are observed by the trajectory of a planet around a star or a natural satellite around a planet. Normally, orbits of this nature are repeating trajectories. To a close approximation, planets and satellites follow elliptic orbits, with the central mass being orbited at a focal point of the ellipse,[2] as described by Kepler's laws of planetary motion.