Lecture, three hours. Limited to graduate students. Results of recent and ongoing missions to Mars are revising many aspects of our understanding of planet and its history. Study highlights major revolutions in thinking about planet, and provides comprehensive overviews as well as current controversies related to Mars' core and magnetism, thermal evolution and volcanism, geology and cratering history, volatiles and climate, atmosphere and its interaction with space environment, and potential pre-biological and biological history. S/U or letter grading.