Circular and Satellite Motion - Mission CG10 Detailed Help

Kepler's third law of planetary motion states that the ratio of ____.

The Law of Harmonies:
Kepler's law of harmonies proposed that the ratio of the square of the periods of any two planets is equal to the ratio of the cube of their average distances from the sun. This magical T2/R3 ratio shows very little variation from planet to planet. An extension of this law would be that the period of orbit must be greater for any planet which is a greater distance from the sun. More distant planets require greater periods of time to orbit than closer planets.