APOD:2015.9.20

Sweet丿Kim (金) 天王星
6 0 0
发表于:2015-09-24 12:49 [只看楼主] [划词开启]

土卫二疑似有全球性的海洋 

影像提供: 

Cassini Imaging Team, SSI, JPL, ESA, NASA

说明: 

土卫二部分表面的是否如输送带般在滚动?针对土星最活跃卫星的影像所进行之最权威诠释指出,事实正是如此。这种在地球上极不寻常的非对称性板块活动,可能带着解开土卫二内部结构的线索,隐指其内部可能有生命得以发展的次表面海洋。


上面这幅由28张照片拼接而成的影像,是2008年卡西尼号太空船在飞越这颗会喷发水冰的卫星后所拍摄。浏览这些影像可见到明显的板块位移,造成大片表面看似向同一方向移动。然而在影像右侧,可见到土卫二上最显著的板块裂缝之一的Labtayt裂谷,一道深达一1公里的峡谷。而土卫二绕行土星时所发生的小振幅晃动,可能指证振动的阻尼是来自次表面的全球性海洋。

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Global Ocean Suspected on Saturn's Enceladus 

Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: Do some surface features on Enceladus roll like a conveyor belt? A leading interpretation of images taken of Saturn's most explosive moon indicate that they do. This form of asymmetric tectonic activity, very unusual on Earth, likely holds clues to the internal structure of Enceladus, which may contain subsurface seas where life might be able to develop. Pictured above is a composite of 28 images taken by the robotic Cassini spacecraft in 2008 just after swooping by the ice-spewing orb. Inspection of these images show clear tectonic displacements where large portions of the surface all appear to move all in one direction. On the image right appears one of the most prominent tectonic divides: Labtayt Sulci, a canyon about one kilometer deep. The magnitude of Enceladus' wobble as it orbits Saturn might indicate damping by a globally extending underground ocean layer.




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