Which of Galileo's Observations of the Motions of the Large

Multiple Choice

Which of Galileo's observations of the motions of the large moons of Jupiter provided the MOST significant change to astronomers' understanding of the solar system?

A) Their motions are counterclockwise (viewed from the north) just like the orbits of the planets.
B) Their orbits were elliptical, just like Kepler predicted.
C) Their orbits obeyed Kepler's second law.
D) The moons farther from Jupiter had longer periods, just as Copernicus had discovered for the planets around the Sun.