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

Question

Quizplus · Accepted Answer

Kepler's third law states that the square of the planet's orbital period (in years) is directly proportional to the cube of the length of its semimajor axis (in astronomical units), therefore P² = a³.

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