Portrait of Aristotle
Corbis-Bettmann.
Aristotle
Aristotle was a Greek philosopher who lived between 384-322 B.C. He was one of the greatest thinkers of the world and his written works encompassed all major areas of thought: logic, science, metaphysics, ethics, and politics.
Aristotle mistakenly believed that the Earth was at the center of the universe and made up of only four elements: earth, water, air, and fire. He also thought that celestial bodies such as the sun, moon, and stars, were perfect and divine, and made of a fifth element called ether. Aristotle's conception of the universe lasted for almost 2000 years, until Copernicus presented his heliocentric theory.
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