The first Law of Planetary Motion states: * A. All planets orbit the Sun in elliptical orbits with the Sun as one common focus B. The line between a planet and the Sun (the radius vector) sweeps out equal areas in equal periods of time. C. The square of a planet's period, T, is directly proportional to the cube of its average distance from the Sun, r T2 ∝ r3 or T2/r3 = k D. Planets move in a circular motion in an orbit

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