2024年08月25日:土卫二表面的鲜明虎纹-（Fresh Tiger Stripes on Saturn's Enceladus）

2024年08月25日:土卫二表面的鲜明虎纹-（Fresh Tiger Stripes on Saturn's Enceladus）--原图下载

Image Credit: NASA,ESA,JPL,SSI,Cassini Imaging Team
说明: 土卫二（Enceladus）的地下海洋，是否透过裂谷向外排气？土卫二暱称为"虎纹"的长条表面结构，证实会朝太空喷发这颗冰冻卫星内部的冰，形成笼罩在南极上空的冰晶云，并造就了土星神祕的E环。 支持的证据来自在2004年到2017年间，绕行土星系统的卡西尼号探测船。这幅高解析的土卫二影像，即是在一次近距离飞越时所拍摄，而其中不寻常的表面虎纹结构，是用泛蓝的假色来呈现。不过，为何土卫二会如此活跃，则仍然是个谜，因为附近和土卫二大小相近的土卫一，是个死寂的卫星。经由分析喷出的冰粒 ，后来更找到了土卫二内部有複杂含碳有机分子的证据。然而，这些富含碳的大分子，支持但无法证明土卫二地下海洋可能有生命。

原文：

Image Credit: NASA,ESA,JPL,SSI,Cassini Imaging Team
Explanation: Do underground oceans vent through canyons on Saturn's moon Enceladus? Long features dubbed tiger stripes are known to bespewing ice from the moon's icy interior into space,creating a cloud of fine ice particles over the moon's South Poleand creating Saturn's mysterious E-ring. Evidence for this has come from therobot Cassini spacecraft that orbited Saturn from 2004 to 2017. Pictured here,a high resolution image of Enceladus is shown from a close flyby. The unusual surface features dubbedtiger stripes are visible in false-color blue. WhyEnceladus is active remains a mystery, as the neighboring moonMimas, approximately the same size, appearsquite dead.An analysis of ejected ice grains has yielded evidence that complex organic molecules exist inside Enceladus.These large carbon-rich molecules bolster -- but do not prove -- that oceans under Enceladus' surface could contain life.