A planet is discovered at a distance of 1 AU from its parent star with a period of 1 year. How does the star's mass compare to our Sun's?
A) The star has the same mass as the Sun.
B) The star's mass is around 2 times smaller than the Sun's.
C) The star's mass is around 2 times larger than the Sun's.
D) The star's mass is around 4 times smaller than the Sun's.
E) The star's mass is around 4 times larger than the Sun's.

Question

Quizplus · Accepted Answer

According to Kepler's Third Law, if a planet orbits at 1 AU with a period of 1 year, the star's mass must be the same as the Sun's.

A Planet Is Discovered at a Distance of 1 AU