Overview
Earth (地球\ちきゅう, Chikyū / アース, āsu) is the third planet of the solar system. It is the only planet (at least known to date) in the solar system inhabited by life forms, and various living organisms, including humans, live there.
The Earth's rotation period is one day and its orbital period is one year.
It has one satellite, the Moon.
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External Links
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地球とは (チキュウとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
