Benchmark 10A
Historical Perspectives: Displacing the Earth from the Center of the Universe
Grades 9-12, page 241

Using the newly invented telescope to study the sky, Galileo made many discoveries that supported the ideas of Copernicus. It was Galileo who found the moons of Jupiter, sunspots, craters and mountains on the moon, and many more stars than were visible to the unaided eye.

See Content Standard G History and Nature of Science (grades 9-12): Historical Perspectives.