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| Earth |
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| Definition: |
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3rd planet from Sun: the third planet in order from the Sun with an orbital period of 365.26 days, a diameter of 12,756 km (7,926 mi), and an average distance from the Sun of 149,600,000 km (93,000,000 mi.) Surrounded by an atmosphere composed primarily of nitrogen and oxygen, it is the only planet in the universe known to support life.
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