Glossary term: 月球
Description: 月球是自身並不發光的天體，但它會反射落在其上的太陽光。這就產生了月球特有的月相。月球是地球唯一的主要天然衛星，其大小和質量在太陽系內的所有天然衛星中排名第五。在英文中，首字母大寫的“Moon”表示月球，而首字母小寫的“moon”則表示太陽系內外的其他天然衛星。與太陽系內的其他衛星相比，月球的體積相對於它所環繞行星的體積的占比是最大的。月球沿圍繞地球的橢圓軌道運行，與地球的平均距離為38.4萬千米。月球沒有大氣層，物質組分與地球類似，內核富含鐵，外層為岩石。這種相似並非偶然：據我們所知，大約45億年前，地球和一顆火星大小的行星碰撞，產生的碎片最終形成了月球，它的大部分物質來自最初的地球地幔。月球表面既有被稱為“月海”的深色區域，也有淺色高地，並布滿了隕擊坑。月球表面積為3.79×107平方千米，體積為2.20×1010立方千米，質量為7.35×1022千克。月球圍繞地球運行的軌道週期的確切數值取決於參考系：相對於遙遠的恆星，月球每27.3天運行一圈（“恆星月”）。對於地球上的觀測者來說，兩個新月之間的間隔時間為29.5天（“朔望月”）。
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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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License: PD Public Domain icons
塞勒涅與月亮相遇，作者Sheila Wiwchar，加拿大
Credit: Sheila Wiwchar/IAU OAE
License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
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Credit: Alessandra Masi/IAU OAE
License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
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License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
Tags:
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Age Ranges:
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License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
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License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
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License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
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