Which of the following is one of Kepler's Laws of Planetary motion?

Question

a
Planets move on elliptical orbits with the sun as the focal point.
b
An object in motion remains in motion.
c
Inner planets orbit in a different direction than outer planets.

Answer 1

a. Planets move on elliptical orbits with the sun as the focal point.

This is the first of Kepler's Laws of Planetary Motion, also known as Kepler's First Law. It states that the orbit of a planet around the sun is an ellipse, with the sun at one of the two foci. The other options do not pertain to Kepler's Laws.