Description: 彗核是彗星的核心。它是一個類似臟雪球的固體，由冰和岩石、塵埃顆粒組成。在遠離太陽的地方，彗核是彗星的唯一組成部分。靠近太陽時，彗核會被陽光加熱。這導致表面的冰升華。升華後的冰及其中的塵埃被噴射出來，以彗尾的形式圍繞著彗核，彗尾指向遠離太陽的方向。

Related Terms:

• Cometary Coma
• Comet
• Cometary Tail

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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