As a consequence Aristotle's cosmology is the weakest part of his philosophical system. We shall limit ourselves to giving a brief summary of this branch of his teaching.
Aristotelian cosmology is based on the principle of the mover and the thing moved.
Every sphere of the heavens is formed of incorruptible matter. God moves the highest sphere. It is formed of the four essences of Empedocles, and its motion is from higher to lower or vice versa. Movement, which comes from the heavenly bodies, is the proximate cause of all the becoming in the world. In the cosmology of Aristotle there are some theoretical points that are worthy of consideration.