海卫一温度极低(约为- 235摄氏度，一个大气压下- 210度左右氮气凝固——译者注)，以至其大部分的氮气都凝聚到了其表面形成霜，这使海卫一成为太阳系内唯一一颗以“氮冰”为主要地表成分的星球。

Triton is so cold that most of its nitrogen is condensed as frost, making it the only satellite in the solar system known to have a surface made mainly of nitrogen ice.

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