One of the most prominent great thinkers of Ancient Greece, philosopher Aristotle, took a stab at theorizing the nature of gravity in the 4th century B.C. Aristotle believed that different elements gravitated toward different sources based on their own internal nature, rather than an external compelling force. The consensus at that time was that the earth was the center of the universe, supported by the complex diagrams constructed by the Roman Ptolemy which could be used to predict the motion of the visible planets. Thus, Aristotle believed that heavy elements were trying to seek their "correct" place at the center of the universe (the center of the earth). For this reason rocks would fall to the ground, but lighter elements like steam would rise to their own natural and "correct" place in the sky. This led Aristotle to the conclusion that heavier elements fall faster.
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