土卫二
泰坦(火箭家族)
土星
天体生物学
地质学
重力场
冰卫星
物理
航天器
转动惯量
地球物理学
流体静力平衡
天文
行星
经典力学
作者
L. Iess,D. J. Stevenson,Marzia Parisi,D. Hemingway,R. A. Jacobson,Jonathan I. Lunine,F. Nimmo,J. W. Armstrong,S. W. Asmar,M. Ducci,Paolo Tortora
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2014-04-04
卷期号:344 (6179): 78-80
被引量:324
标识
DOI:10.1126/science.1250551
摘要
Inside Enceladus Saturn's moon Enceladus has often been the focus of flybys of the Cassini spacecraft. Although small—Enceladus is roughly 10 times smaller than Saturn's largest moon, Titan—Enceladus has shown hints of having a complex internal structure rich in liquid water. Iess et al. (p. 78 ) used long-range data collected by the Cassini spacecraft to construct a gravity model of Enceladus. The resulting gravity field indicates the presence of a large mass anomaly at its south pole. Calculations of the moment of inertia and hydrostatic equilibrium from the gravity data suggest the presence of a large, regional subsurface ocean 30 to 40 km deep.
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