描述: 彗核是彗星的核心。它是一个类似脏雪球的固体，由冰和岩石、尘埃颗粒组成。在远离太阳的地方，彗核是彗星的唯一组成部分。靠近太阳时，彗核会被阳光加热。这导致表面的冰升华。升华后的冰及其中的尘埃被喷射出来，以彗尾的形式围绕着彗核，彗尾指向远离太阳的方向。

相关词条

• 彗发
• 彗星
• 彗尾

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