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Glossary term: 地球
Description: 地球是太陽系中距離太陽第三近的行星，也是第五大行星。它是一顆岩石類的行星，半徑約為6400公里，質量大約為六百萬兆千克。
地球與太陽的平均距離約為1.5億公里，這個距離被定義為一個天文單位。地球繞太陽一週需要365.26天。地球有一顆天然衛星，即月球。
地球是包括人類的數百萬種生物的家園；迄今為止，地球是已知宇宙中唯一有生命存在的地方。科學家們認為地球形成於大約45.4億年前。地球有一個大氣層和磁層，它們能夠阻擋有害輻射，從而促進生物的繁衍。地球表面還有廣泛的水覆蓋（這是太陽系中唯一已知有廣泛水體的行星），使其呈現出藍色。
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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
This is an automated transliteration of the simplified Chinese translation of this term
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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Related Media
阿波羅 17 號觀測到的地球
Caption: 1972 年 12 月 7 日，阿波羅 17 號飛船乘員在前往月球途中拍攝的地球全景，距離約 29000 公里（18000 英里）。圖中顯示了非洲、南極洲和阿拉伯半島。
Credit: 美國國家航空航天局/阿波羅 17 號機組人員/阿波羅項目檔案館
Credit: 美國國家航空航天局/阿波羅 17 號機組人員/阿波羅項目檔案館
License: PD Public Domain icons
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