Final answer:
Kepler's Third Law relates the square of a planet's orbital period to the cube of its semi-major axis, reflecting a precise mathematical relationship in planetary motion.
Step-by-step explanation:
Kepler's Third Law, often described in terms of planetary motion, is a mathematical relationship in physics that explains the motion of planets around the Sun. Specifically, it states that the square of a planet's orbital period (T) is directly proportional to the cube of the semi-major axis (a) of its orbit, which is the average distance between the planet and the Sun. The law is commonly expressed as T2 ≈ a3. This relationship holds true for all planets in the Solar System and can be used to calculate the orbital period of a planet if its distance from the Sun is known, or vice versa.