Question

which planets orbit was kepler first studying when he began to develop his laws of orbital motion? (1 point)
earth
mars
jupiter
saturn

Explanation:

Kepler began his work on orbital motion laws by studying Mars. His mentor Tycho Brahe had extensive data on Mars' orbit, which Kepler analyzed. This led him to discover that Mars' orbit was an ellipse (not a circle as previously thought), a key insight for his laws.

Answer:

Mars