Which of the Following Was NOT Discovered by Galileo Using

Which of the following was NOT discovered by Galileo using a telescope?

A) The Moon has a heavily cratered surface.
B) Jupiter has four moons that orbit around it.
C) Mars has a polar ice cap similar to the Earth.
D) The planet Venus goes through phases similar to those of the Moon.
E) The Milky Way is a collection of countless numbers of individual stars.