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Astronomy: An Overview I - Pgm 17 - Moons and Rings In this class, Professor João Steiner, from the Institute of Astronomy, Geophysics and Atmospheric Sciences at USP, studies the moons of Jupiter, Saturn, Uranus, Neptune, Mars and Earth. He also talks about water and the types of rain present on planets and moons in the Milky Way. The professor also mentions Saturn's rings and the geological activity of planets like Earth.