水星上都是水吗?相信不少同学曾有过这个疑问。现在,人们发现水星北极附近的环形山里有纯净冰存在的证据。这一结果是美国“信使”号水星探测器经过79亿千米的曲折征程才获得的。尽管水星表面温度大都在400℃以上,许多极地环形山却永远处于阴影中。这是因为水星的转动轴与其轨道平面垂直,极地从不朝向太阳。“信使”号发射的红外激光脉冲显示了水 Mercury is water? I believe many students had had this question. It is now discovered that there is evidence of pure ice in the crater near Mercury’s north pole. This result was obtained after 7.9 billion km of tortuous journey by Mercury Detector from the United States. Although most of Mercury’s surface temperatures are above 400 ° C, many polar craters are forever shadowed. This is because Mercury’s axis of rotation is perpendicular to its orbital plane, and never toward the sun. Infrared laser pulses emitted by the messenger show water