太阳系十大魅力图片:木卫一有张“比萨脸”(4)
火星湖泊
4、火星湖泊
美国宇航局相继对火星展开了深入勘测,每次火星勘测任务的“主要指令”就是寻找水。2008年,火星“凤凰”号探测器在火星表面直接找到了液态水的证据,此外其他的飞行器的人造卫星也发现了这颗行星表面曾经存在液态水的样本证据。
研究人员认为,火星表面的耶泽洛(Jezero Crater)碰撞陨坑在火星诺亚纪时期(38-46亿年前)存在着一个比美国太浩湖(Lake Tahoe)还要大的湖泊。如图所示,在火星耶泽洛碰撞陨坑中的绿色部分很可能是远古时期湖水冲积形成的粘土物质,在这个湖泊中形成了三角洲地带。
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