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Aristotle's cosmology:
Aristotle argued that there were four fundamental elements, fire, air, water and earth. In Aristotle's system there was no such thing as void space. All space was filled with some combination of these elements.
In Aristotle's Cosmology, each of these four elements (earth, water, fire and air) had a weight. Earth was the heaviest, water less so, and air and fire the lightest. According to Aristotle the lighter substances moved away from the center of the universe and the heaver elements settled into the center.
While these elements attempted to sort themselves out, to achieve this order, most of experience involved mixed entities.
Aristotle posited that there was a fifth substance, the quintessence, that was what the heavens were made of, and that the heavens were a place of perfect spherical motion.
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