Question

which idea about planets did both pythagoras and johannes kepler believe?
a the planets are out of order.
b the planets move in harmony.
c the planets are glass spheres.
d the planets are really moons.

Explanation:

Pythagoras believed in the harmony of the spheres, and Kepler also had a concept related to the harmony in planetary motion. The idea of planets moving in harmony was a common thought that connected both of them.

Answer:

B. The planets move in harmony.