A significant contribution of Kepler to our understanding of the solar system was the
A) discovery that Earth orbits the Sun.
B) discovery that planetary orbits are not circular.
C) observation of the phases of Venus.
D) idea of a gravitational force between Earth and the Sun.

Question

Quizplus · Accepted Answer

Kepler's significant contribution was the discovery that planetary orbits are elliptical, not circular, as stated in his first law of planetary motion. This corrected the long-held belief in circular orbits.

A Significant Contribution of Kepler to Our Understanding of the Solar