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火星上发现季节性“涓涓细流”美国宇航局(NASA)的“火星勘测轨道飞行器”(MRO)在火星南半球中纬度部分比较温暖的地区的较陡山坡中,观测到了比较暗的、随季节而变化的“涓涓细流”。这些细流宽约0.5～5米,长度约几百米,朝向火星的赤道方向。每个春末开始出现,然后随着火星表面温度的升高而慢慢伸长,到夏季时达到最长,秋初开始慢慢消退,直至冬季消失。而且,在细流存在的区域中,有的温度太高而不可能使得二氧化碳凝结成“霜”;有的温度又太低,而不可能使液态纯水存在。美国亚利桑
Seasonal “trickle” on Mars NASA’s Mars Reconnaissance Orbiter (MRO) observed darker steep slopes in warmer mid-latitudes parts of southern hemisphere Mars Change with the seasons “trickle ”. The trickle width of about 0.5 to 5 meters, a few hundred meters in length, toward the equatorial direction of Mars. It begins to appear in late spring and then slowly grows as the surface temperature of Mars increases, reaching the longest in summer, slowly receding in early autumn and disappears in winter. Moreover, in areas where fine streams exist, some are too hot to condense the carbon dioxide into “frosts”; others are too cold to be liquid pure water. Arizona, United States