Earth, Definition, Size, Composition, Temperature, Mass, & Facts

Earth, third planet from the Sun and the fifth largest planet in the solar system in terms of size and mass. Its single most outstanding feature is that its near-surface environments are the only places in the universe known to harbor life. Learn more about development and composition of Earth in this article.

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Earth, Definition, Size, Composition, Temperature, Mass, & Facts

Earth, Definition, Size, Composition, Temperature, Mass, & Facts

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