The speeds of the planets about the sun depend on
A)their distances from the sun.
B)the masses of the planets.
C)their periods of rotation.
D)None of the above are correct.

Question

Quizplus · Accepted Answer

Kepler's third law states that the square of a planet's period of revolution around the Sun is proportional to the cube of its semi-major axis (distance from the Sun). Therefore, the speed of the planet is directly related to its distance from the Sun. The mass of the planet does not play a role in determining its speed around the Sun.

The Speeds of the Planets About the Sun Depend on