Question

identifying keplers contribution
which contributions did johannes kepler make? select three options.
he revived aristotles model of the solar system.
he solved ptolemys model by proving elliptical orbits.
he proved galileos calculations were incorrect.
he determined that planets move faster when closer to the sun.
he discovered laws of planetary motion.

Explanation:

Kepler's work included replacing the circular - orbit models (like Ptolemy's) with elliptical orbits. His second law states that a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time, meaning planets move faster near the Sun. His three laws of planetary motion are fundamental in astronomy. He did not revive Aristotle's model and did not prove Galileo's calculations incorrect.

Answer:

1. He solved Ptolemy’s model by proving elliptical orbits.
2. He determined that planets move faster when closer to the Sun.
3. He discovered laws of planetary motion.