Kepler's third law says that a comet with a period of 160 years will have a semimajor axis of
A) 30 AU.
B) 50 AU.
C) 90 AU.
D) 140 AU.
E) 210 AU.

Question

Quizplus · Accepted Answer

Kepler's third law states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. In this case, the period is 160 years, so the semi-major axis is 30 AU.

Kepler's Third Law Says That a Comet with a Period