FreeRange user liu monokeroz wanted you to see this:
图中是火星阿拉比区的暗色沙丘和波痕陨坑，沙丘之所以呈现暗色是由于它们源自玄武岩。火星冬季时陨坑底存在的二氧化碳固态形式火星表面分支状沙丘和脊弧状沙丘火星表面尘暴形成的蓝灰色旋转沙丘，看上去它就像是微...
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