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水星是最靠近太阳的行星,中国古代称水星为辰星,它是太阳系中运行最快的行星。水星的表面和月球表面极为相似,既有高山,也有平原,还有令人胆寒的悬崖峭壁,从地球上看水星,它会象月球一样出现周期性的圆缺变化。