Glossary term: 海卫一
Description: 海卫一是海王星最大的卫星。它比冥王星大，事实上，由于其轨道的不寻常特性以及我们对其成分的了解，海卫一很可能是一颗被海王星捕获的矮行星。海卫一的表面有冰覆盖，水冰上覆盖着一层冻结的氮气，围绕着一个主要由岩石组成的核心。旅行者 2 号是迄今为止唯一到访过海卫一的太空探测器，它发现该卫星地质活跃，有氮气喷射，而且很可能有冰火山（"低温火山"）--类似于地球上的火山，但喷出的是水和氨，而不是液态的岩石。
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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
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