The simplified version of Kepler's third law of planetary motion relates the period P (in sidereal years) to the length of the semimajor axis a (in astronomical units) in which way? A) P² = a³ B) P = a² C) P = 1/a² D) P³ = a²

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Kepler's third law states that the square of the orbital period (P) of a planet is directly proportional to the cube of the semimajor axis (a) of its orbit, which is expressed as P² = a³.

The Simplified Version of Kepler's Third Law of Planetary Motion