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Several new scenarios of the Moon-forming giant impact have been proposed to reconcile the giant impact theory with the recent recognition of the volatile and refractory isotopic similarities between Moon and Earth. Two scenarios leave the post-impact Earth spinning much faster than what is inferred from the present Earth-Moon system's angular momentum. The evection resonance has been proposed to...
Mercury’s surface magnetic field is unique among planetary magnetic fields for its weak intensity, spin-aligned axisymmetry, and large dipole offset. An Earth-like dynamo setup applied to Mercury does not reproduce these features. Here we explain the magnetic field observations by a combination of two effects: (1) a stably stratified layer at the top of the outer core, and (2) a degree-1 north–south...
The isotopic similarity of the Earth and Moon has motivated a recent investigation of the formation of the Moon with a fast-spinning Earth (Cuk, M., Stewart, S.T., [2012]. Science, doi:10.1126/science.1225542). Angular momentum was found to be drained from the system through a resonance between the Moon and Sun. They found a narrow range of parameters that gave results consistent with the current...
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