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Kepler's third law relates a planet's orbital period T to its semi-major axis a as?
AT is proportional to a
BT^2 is proportional to a
CT is proportional to a^3
DT^2 is proportional to a^3
Answer & Solution
Correct answer: D. T^2 is proportional to a^3
The square of the period varies as the cube of the semi-major axis, so T^2/a^3 is constant for one primary.
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