Glossary term: 地球
Description: 地球是太阳系中距离太阳第三近的行星，也是第五大行星。它是一颗岩石类的行星，半径约为6400公里，质量大约为六百万兆千克。
地球与太阳的平均距离约为1.5亿公里，这个距离被定义为一个天文单位。地球绕太阳一周需要365.26天。地球有一颗天然卫星，即月球。
地球是包括人类的数百万种生物的家园；迄今为止，地球是已知宇宙中唯一有生命存在的地方。科学家们认为地球形成于大约45.4亿年前。地球有一个大气层和磁层，它们能够阻挡有害辐射，从而促进生物的繁衍。地球表面还有广泛的水覆盖（这是太阳系中唯一已知有广泛水体的行星），使其呈现出蓝色。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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阿波罗 17 号观测到的地球
Credit: 美国国家航空航天局/阿波罗 17 号机组人员/阿波罗项目档案馆
License: PD Public Domain icons
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