MESSENGER has provided multiple lines of evidence that Mercury’s polar regions host water ice.
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http://messenger.jhuapl.edu/index.html#科学就是那么神奇超乎人类的想象,离太阳那么近的水星居然真的有水,只不过藏身极地陨石坑深处。
还有下面两篇关于水星发现水冰的报道
MESSENGER Data Provides New Evidence for Ice on Mercury
First Photos of Water Ice on Mercury Captured by NASA Spacecraft