词条 海卫一
描述: 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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Neptune’s Moon Triton Fosters Rare Icy Union
图注： An image of Neptune's moon Triton taken by NASA's Voyager 2 spacecraft. This image covers the south pole region of Triton. Triton's surface is covered by an icy mix of frozen nitrogen, water and carbon dioxide. Below the surface some of these compounds are thought to be in a liquid state. These liquids can burst out of the surface through geysers. These geysers produce the dark streaks seen in this image.
来源： NASA/JPL
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