This paper discusses Aristotle's theory on the question of motion and change and the
structure of the physical universe as
opposed to that of his mentor Plato. It looks at how he arrived at his view of the
structure of the universe through the application of reason and its
limitations. It shows how, in his analysis of the prime mover, Aristotle shows some of those limitations as he develops his ideas based on limited evidence and how he explores some ideas that are simply not clearly stated.