火星表面发现奇特黑色条纹图案 如同人类纹身
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美航局拍到的火星纹身
新浪科技讯
北京时间10月28日消息,美国宇航局网站近日公布了一张火星高分辨率照片,照片显示火星浅红色地表上有纵横交错的黑色条纹,好似刻意为火星打造的“纹身”。
火星“纹身”是由正在绕火星飞行的“火星勘测轨道飞行器”携带的“高清晰度科学实验成像”(HiRISE)机所拍摄的。事实上,该相机更像是一部口径为半米的天文望远镜,其能够从超过300公里的高空看到火星表面直径小于30厘米的物体。图森亚利桑那大学负责操作“高清晰度科学实验成像”照相机,美国科罗拉多州鲍尔航天科技公司负责制造该仪器。
火星表面扭曲的黑色条纹似乎被有意印刻在火星浅色的沙丘上。科研人员认为这些火星“纹身”是火星尘旋风所导致的。火星尘旋风,又被称为“风魔”,是火星表面强烈增温而生成的小旋风,以卷起地面尘沙和轻小物体形成旋转的尘柱为特征。
火星尘旋风的形成方式跟地球上的尘暴一样,在地球上干燥炎热的沙漠地区也有类似的现象。白天地面温度升高,使得地表气温升高。这一层热空气上升,位于上方的冷空气下降,形成垂直对流体。水平阵风导致该对流体发生旋转,形成尘卷。尘卷在火星表面移动的过程中,会把松软的尘埃卷起来,在身后留下黑色轨迹。这种尘旋风不会对任何太空船构成威胁,尘旋风还可以清除火星探测器表面的灰尘,使得探测器表面的太阳能电池板接受更充足的阳光。
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