Multiple choice

______was a German astronomer who discovered that all planets have elliptical orbits.

  1. Ptolemy

  2. Johannes Kepler

  3. Galileo

  4. Copernicus

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Johannes Kepler, working with Tycho Brahe's observational data, discovered that planets move in elliptical orbits rather than circular ones. This was a revolutionary finding that corrected the Copernican model and became part of Kepler's laws of planetary motion.