According to Kepler’s Third Law of Planetary Motion, the square of the orbital period T of a planet is directly proportional to the:

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A Cube of the semi-major axis of its orbit (r³)
B Square of the semi-major axis of its orbit (r²)
C Semi-major axis of its orbit (r)
D Inverse square of the semi-major axis of its orbit (1/r^2)

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Answer: A. Cube of the semi-major axis of its orbit (r³)

Correct Option: A) Cube of the semi-major axis of its orbit (r^3)
Explanation: Kepler's third law (the law of periods) states that T^2 is proportional to r^3: the square of the time period of revolution is proportional to the cube of the mean distance from the Sun.

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According to Kepler’s Third Law of Planetary Motion, the square of the orbital period T of a planet is directly proportional to the:

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