What planet did the ancient Greeks not know about?

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The greek Aristotle writted a theorie of the universe based on what Greeks considered geometrical perfect bodies; 5 bodies, then 5 planets: Mercury, Venus, Mars, Jupiter, and Saturn. Greeks do not have considered the Earth a planet.The do not have known about Uranus, Neptune, and Pluton.Today, have been discovered far objects with equal or suspected bigger size than Pluton (like Quaoar), and Pluton is not more considered a planet.
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