Glossary term: 海衛一
Description: 海衛一是海王星最大的衛星。它比冥王星大，事實上，由於其軌道的不尋常特性以及我們對其成分的了解，海衛一很可能是一顆被海王星捕獲的矮行星。海衛一的表面有冰覆蓋，水冰上覆蓋著一層凍結的氮氣，圍繞著一個主要由岩石組成的核心。旅行者 2 號是迄今為止唯一到訪過海衛一的太空探測器，它發現該衛星地質活躍，有氮氣噴射，而且很可能有冰火山（"低溫火山"）--類似於地球上的火山，但噴出的是水和氨，而不是液態的岩石。
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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
This is an automated transliteration of the simplified Chinese translation of this term
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