If a planet were to exist in our solar system in a circular orbit with a radius of 3 AU,about how long would it take to orbit the Sun once?
A) 5.2 years
B) 2.1 years
C) 27 years
D) 3 years

Question

Quizplus · Accepted Answer

According to Kepler's Third Law, the orbital period (T) in years is related to the semi-major axis (a) in astronomical units (AU) by the formula T^2 = a^3. For a radius of 3 AU, T^2 = 3^3 = 27, so T = √27 ≈ 5.2 years.

If a Planet Were to Exist in Our Solar System