月球真极漫游和过去低偏心率同步月球轨道的证据
Evidence for Lunar True Polar Wander, and a Past Low-Eccentricity, Synchronous Lunar Orbit
摘要：
正如拉普拉斯在200年前首次指出的那样，考虑到月球目前的轨道和旋转状态，月球的旋转和潮汐隆起明显大于预期。这种过度的变形被归因于一个化石人物，当月球更接近地球时被冻结。然而，观测到的数字仅与偏心和非同步轨道相一致，与我们对月球形成和演化的理解相反。在这里，我们表明，月球质量和影响盆地有显着的贡献，观察到的月球的数字。去除它们的贡献揭示了一个错位的化石图，与早期的真正的极地漂移（由南极-艾特肯盆地的形成驱动）和早期的低偏心率，同步月球轨道相一致。这个新的自洽模型解决了行星科学中一个长期存在的问题，并将为未来月球动力学演化和早期发电机的研究提供信息。
英文摘要：
As first noted 200 years ago by Laplace, the Moon's rotational and tidal bulges are significantly larger than expected, given the Moon's present orbital and rotational state. This excess deformation has been ascribed to a fossil figure, frozen in when the Moon was closer to the Earth. However, the observed figure is only consistent with an eccentric and non-synchronous orbit, contrary to our understanding of the Moon's formation and evolution. Here, we show that lunar mascons and impact basins have a significant contribution to the observed lunar figure. Removing their contribution reveals a misaligned fossil figure consistent with an early epoch of true polar wander (driven by the formation of the South Pole-Aitken Basin) and an early low-eccentricity, synchronous lunar orbit. This new self-consistent model solves a long-standing problem in planetary science, and will inform future studies of the Moon's dynamical evolution and early dynamo.
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