Question

Which planet’s orbit was Kepler first studying when he began to develop his laws of orbital motion?
Responses

Earth
Earth - no response given

Mars
Mars - no response given

Saturn
Saturn - no response given

Jupiter

Answer 1

Kepler was first studying the orbit of Mars when he began to develop his laws of orbital motion. His work with the data collected by Tycho Brahe led him to formulate his three laws of planetary motion.