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
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