67P彗星表面的尘埃喷流
(原标题: A Dust Jet from the Surface of Comet 67P)
2023-11-26
浏览次数: 18
彗星尾巴从何而来？在彗核上没有明显的地方可以产生彗尾的喷流。然而，在2016年，欧洲航天局的罗塞塔号宇宙飞船不仅拍摄到了67P/丘留莫夫-格拉西门科彗星上出现的喷气机，而且还直接穿过了它。这是一张生动的照片，显示了一个明亮的羽状物从一个小的圆形斜坡上冒出来，斜坡的一侧被10米高的墙包围着。对罗塞塔数据的分析表明，喷流由尘埃和水冰组成。崎岖但不寻常的地形表明，在多孔表面的深处，可能发生了什么事情，形成了羽流。这张照片是在罗塞塔号任务结束前两个月拍摄的，它在受控的情况下撞击了67P彗星的表面。
查看原文解释
Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. In 2016, though, ESA's Rosetta spacecraft not only imaged a jet emerging from Comet 67P/Churyumov-Gerasimenko, but flew right through it. Featured is a telling picture showing a bright plume emerging from a small circular dip bounded on one side by a 10-meter high wall. Analyses of Rosetta data show that the jet was composed of both dust and water-ice. The rugged but otherwise unremarkable terrain indicates that something likely happened far under the porous surface to create the plume. This image was taken about two months before Rosetta's mission ended with a controlled impact onto Comet 67P's surface.