期刊
SCIENCE
卷 319, 期 5870, 页码 1649-1651出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1151639
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Cassini radar observations of Saturn's moon Titan over several years show that its rotational period is changing and is different from its orbital period. The present- day rotation period difference from synchronous spin leads to a shift of similar to 0.36 per year in apparent longitude and is consistent with seasonal exchange of angular momentum between the surface and Titan's dense superrotating atmosphere, but only if Titan's crust is decoupled from the core by an internal water ocean like that on Europa.
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