2017年10月09日:穀神星不寻常的阿胡纳山-(Unusual Mountain Ahuna Mons on Asteroid Ceres)

2017年10月09日:穀神星不寻常的阿胡纳山-(Unusual Mountain Ahuna Mons on Asteroid Ceres)

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2017-10-09 / 0 评论 / 0 阅读 / 正在检测是否收录...

2017年10月09日:穀神星不寻常的阿胡纳山-(Unusual Mountain Ahuna Mons on Asteroid Ceres)
2017年10月09日:穀神星不寻常的阿胡纳山-(Unusual Mountain Ahuna Mons on Asteroid Ceres)--原图下载


Image Credit: Dawn Mission, NASA, JPL-Caltech, UCLA,MPS/DLR/IDA
说明: 穀神星上的这座不寻常山峰是怎么形成的?在太阳系介于火星木星之间的小行星主带里绕行的穀神星,是其中现知最大的小行星,而阿胡纳山则是穀神星上最大的山峰。阿胡纳山与人类先前看过的山岳全然不同,举例来说,它的山体并没有镶着古老的撞击坑,而是披着垂直的条状结构。其中的一种假说指出,阿胡纳山是一座冰火山,形成于这颗矮行星的反面受到猛烈撞击,因地震波在另一侧会聚、崩解表层所造成的。明亮的辐条状结构可能是高反射率的盐类,也因此,其成分和最近见到的着名穀神星亮斑物质类似。这张高度加倍的数位主题影像,建构自黎明号太空船在去年拍摄的表面图。(Ahuna Mons 阿胡纳山)

原文:

Image Credit: Dawn Mission, NASA, JPL-Caltech, UCLA,MPS/DLR/IDA
Explanation: What created this unusual mountain?Ahuna Mons is the largest mountain on the largest known asteroid in our Solar System, Ceres, which orbits our Sun in the main asteroid belt between Mars and Jupiter.Ahuna Mons, though, is like nothing that humanity has ever seen before.For one thing, its slopes are garnished not with old craters but young vertical streaks. One hypothesis holds that Ahuna Mons is an ice volcano that formed shortly after a large impact on the opposite side of the dwarf planet loosened up the terrain through focused seismic waves. The bright streaks may be high in reflective salt, and therefore similar to other recently surfaced material such as visible in Ceres' famous bright spots. The featured double-height digital image was constructed from surface maps taken of Ceres last year by the robotic Dawn mission.

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