"Which of the following was NOT done by Galileo Galilei?
explaining retrograde motion with the heliocentric hypothesis
discovering that Venus goes through phases (like the Moon)
turning the telescope to the sky and believing what it showed his eyes
discovering four large moons around Jupiter
Question 15
Kepler's first law states that the orbits of the planets are based on
He came to this conclusion
ellipses, the suggestion of Tycho Brahe and Galileo Galilei
ellipses, his personal preferences
ellipses; observations of the planets
circles, the work of ancient astronomers"