What is a Planet? - NASA Science
By A Mystery Man Writer
Last updated 14 Jul 2024
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The Definition of a Planet What is a planet? According to the Merriam-Webster dictionary, the word planet goes back to the ancient Greek word planēt, and it means “wanderer.” The International Astronomical Union (IAU) – the group of astronomers that names objects in our solar system – planets originally were defined as objects that moved […]
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What is a Planet? - NASA Science
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