一颗红色星球上的冰云
(原标题: Ice Clouds over a Red Planet)
2024-12-03
浏览次数: 19
如果你能站在火星上——你会看到什么？你可能会看到，在灰蒙蒙的橙色天空下，一片覆盖着岩石的巨大橙色景观，地平线上是蓝色的太阳，头顶上盘旋着形状奇特的水云。这只是去年3月由美国宇航局的滚动探测器毅力号拍摄到的景象。火星表面的橙色是由火星泥土中生锈的铁造成的，其中一些很小，可以被风吹到大气中。太阳升起附近的蓝色色调是由太阳的蓝光被漂浮的尘埃优先散射出来造成的。右边的浅色云很可能是由水冰组成的，看起来在火星大气层的高处。其中一些云的形状在地球上是不寻常的，仍然是研究的主题。
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If you could stand on Mars -- what might you see? You might look out over a vast orange landscape covered with rocks under a dusty orange sky, with a blue-tinted Sun over the horizon, and odd-shaped water clouds hovering high overhead. This was just the view captured last March by NASA's rolling explorer, Perseverance. The orange coloring is caused by rusted iron in the Martian dirt, some of which is small enough to be swept up by winds into the atmosphere. The blue tint near the rising Sun is caused by blue light being preferentially scattered out from the Sun by the floating dust. The light-colored clouds on the right are likely composed of water-ice and appear high in the Martian atmosphere. The shapes of some of these clouds are unusual for Earth and remain a topic of research.