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土卫七表面如海绵状


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来自美国宇航局卡西尼号探测器近日拍摄的图片。现已探测土星拥有62颗环绕的卫星,土卫七表面在黑暗环境下看起来就像海绵状,当然这表面坑坑洼洼全是巨大深陷的陨石坑。

土卫七拥有大量畸形陨坑,从而使其表面看上去像海绵状。照片中所呈现该卫星表面色彩微妙变化是表面成份之间的差异。在多数陨坑底部可能存在着一些未知暗色物质。科学家对比分析图像中土卫七表面的亮光特征,认为 某些地区的暗色物质可能厚几十米。据悉,土卫七的直径大约250公里,它以不规则方式旋转,卫星密度非常低,可能是由于具有大量的洞穴结构导致的。

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