In its simplest form for the Solar System, what proportionality does Kepler’s Third Law establish?
Answer
The square of the period is proportional to the cube of the semi-major axis (P^2 ∝ a^3).
Kepler's Third Law states that for objects orbiting the Sun, the square of the period ($P^2$) is directly proportional to the cube of the semi-major axis ($a^3$).
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