Question

State and prove kepler's 3rd law of planetary motion

Answer 1

1.) all planets move about the sun in elliptical orbits,having the sun as one of the foci.
2.) a radius vector joining any planet to the sun sweeps out equal areas in equal lenght of time.
3.) The squares of the sidereal period (of revolution) of the planets are directly proportional to the cubes of their mean distance from the sun.
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