Science & Tech
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Earth is the third planet from the Sun and the largest of the terrestrial planets. Although it is only the fifth largest planet in size and mass, it is the densest of all the planets at 5,513 kg/m3. Earth is the only planet in the solar system not named after a mythological being. Its name is derived instead from the Old English word "ertha" and the Anglo-Saxon word "erda," meaning ground or soil.
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