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| | Links SQL: Physical Science/Astronomy/1. Fundamentals/(b) Greek Astronomy |
 | | He believed the primary substance of the universe to be air, which could form the other elements of water, Earth, and fire by rarefaction and condensation. |
 | | 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 of Stagira (384-322 BC) accepted the heavenly spheres of Eudoxus, thought the Earth to be spherical, and imagined a perfectly spherical unchanging universe centered on the Earth. |
| www.mhhe.com /links/1258/1226/1388/1453/index.html (691 words) |
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