Question

What must you know to solve Kepler's third law, the law of periods?

Answer 1

Answer:

D. period of the orbit

Answer 2

Answer: B. Period of the orbit

Explanation:

According to the Third Kepler’s Law of Planetary motion “The square of the orbital period of a planet is proportional to the cube of the semi-major axis (size) of its orbit”.

Talking in general, this law states a relation between the orbital period $T$ of a body (moon, planet, satellite) orbiting a greater body in space with the size $a$ of its orbit.

This Law is originally expressed as follows:

$T^{2}=\frac{4\pi^{2}}{GM}a^{3}$

Where;

$G$ is the Gravitational Constant

$M=1.9(10)^{27}kg$ is the mass of the massive (greater) body

$a$  is the semimajor axis of the orbit of the smaller body