Multiple choice

Which astronomer discovered that planets travel in elliptical orbits?

  1. Copernicus

  2. Galileo

  3. Kepler

  4. Newton

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

Johannes Kepler used Tycho Brahe's observational data to formulate his three laws of planetary motion, the first of which states that orbits are elliptical.