Description: 衛星是圍繞行星、矮行星或小行星等較小天體運行的天體。地球有一顆衛星，叫做月球。太陽系的大多數行星都有衛星，但水星和金星沒有。矮行星冥王星有幾顆衛星，少數其他矮行星和小行星也有衛星。這裡的衛星是指天然衛星，用於通信或科學目的的人造衛星不屬於此類。

許多衛星是在圍繞行星、矮行星或其他天體的軌道上形成的。人們認為，月球是在太陽系形成的早期階段，由地球和一顆行星發生大碰撞後，由拋射出的物質形成並圍繞地球運行的。其他許多衛星（大多較小）都是小行星，它們被所環繞天體的引力俘獲。

Related Terms:

• 小行星
• 矮行星
• 月球
• 人造衛星
• 衛星

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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