A Comet Is Found in a Highly Elliptical Orbit with a Semi-Major

Multiple Choice

A comet is found in a highly elliptical orbit with a semi-major axis equal to one astronomical unit (AU) .According to Kepler's third law of planetary motion,what would the sidereal period of this comet be?

A) It would be more than one year.
B) It would be one year.
C) It would be less than one year.
D) It would be 76 years; the same for every comet.