Kepler s first law of planetary motion implies that
A) the planets move at a constant speeds at all points in their orbits.
B) the planets all move around the Earth in elliptical orbits.
C) uniform circular motion is adequate to describe the motion of all planets.
D) planets move in elliptical orbits around the sun.

Question

Quizplus · Accepted Answer

Kepler's first law of planetary motion states that planets move in elliptical orbits around the sun, with the sun at one of the foci of the ellipse. This law replaced the previous assumption that planets moved in circular orbits, which was proven inaccurate by Kepler's observations. Kepler's first law of planetary motion states that planets move in elliptical orbits around the sun. This means that the path of the planet around the sun is not a perfect circle, but rather a slightly elongated shape resembling an oval. This is a fundamental concept in understanding the motion and behavior of planets in our solar system. Choices A and C are not correct as they imply that the motion of planets is strictly uniform and circular, which is not in line with Kepler's first law. Choice B is also incorrect as it suggests that all planets move around the Earth, which is not accurate.

Kepler S First Law of Planetary Motion Implies That