In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: This man noted that the Platonic solids could be uniquely inscribed in a sphere, and nested them in his model of the Solar System. This man's Mysterium Cosmographicum was the first published defense of the heliocentric system. One (*) law formulated by this man relates the square of an object's orbital period to the cube of its semimajor axis, and he also hypothesized that the sun was one focus of an ellipse. The second of his namesake laws states that planets orbiting the sun sweep out the same area in the same amount of time due to the conservation of angular momentum. For ten points, name this German astronomer and assistant to Tycho Brahe who formulated three laws of planetary motion.
A:
Social Science