text: With Poinsot, this scientist names a set of polyhedra obtained by stellating the doÂ•decaÂ•hedron and iÂ•cosaÂ•hedron.
full_question: With Poinsot, this scientist names a set of polyhedra obtained by stellating the doÂ•decaÂ•hedron and iÂ•cosaÂ•hedron. This man is the namesake of a conjecture which states that approximately 74.04 percent is the maximum possible density of sphere packing arrangements. His Mysterium Cosmographicum proposed that the solar system could be modelled as a series of nested platonic solids. The conservation of angular momentum can be used to derive his law of areas. This scientist analyzed Tycho Brahe's data to determine that planetary orbits are elliptical. For 10 points, name this scientist who developed three laws of planetary motion.
first_sentence: With Poinsot, this scientist names a set of polyhedra obtained by stellating the doÂ•decaÂ•hedron and iÂ•cosaÂ•hedron.
raw_answer: Johannes Kepler