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火星上的温差很大,夏天时从零下153摄氏度到22摄氏度,水在火星上仅以冰的形态存在,是被冻住的“生命源泉”。虽然在低纬度上土壤内仅有约5%的水分(从重量上来说),但在两极附近的土壤水分却高达60%。
The temperature difference on Mars is very high. During the summer, it ranges from minus 153 degrees Celsius to 22 degrees Celsius. Water only exists in the form of ice on Mars and is frozen. Although only about 5% moisture (in weight) is available in the soil at low latitudes, soil moisture is as high as 60% near the poles.