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Origin of the Moon

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arxiv 2103.02045 v1 pith:DDHLSX4G submitted 2021-03-02 astro-ph.EP physics.geo-phphysics.space-ph

classification astro-ph.EPphysics.geo-phphysics.space-ph
keywords moonearthcoreearth-moonmassoriginsystemaddition
verification ladder T0 review T1 audit T2 compute T3 formal
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The Earth-Moon system is unusual in several respects. The Moon is roughly 1/4 the radius of the Earth - a larger satellite-to-planet size ratio than all known satellites other than Pluto's Charon. The Moon has a tiny core, perhaps with only ~1% of its mass, in contrast to Earth whose core contains nearly 30% of its mass. The Earth-Moon system has a high total angular momentum, implying a rapidly spinning Earth when the Moon formed. In addition, the early Moon was hot and at least partially molten with a deep magma ocean. Identification of a model for lunar origin that can satisfactorily explain all of these features has been the focus of decades of research.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Growing Planets Produce Extreme Dust Signatures

    astro-ph.EP 2026-07 conditional novelty 7.0 of 10

    Using 786 smoothed-particle-hydrodynamic simulations, the authors find vaporized-ejecta mass scales almost linearly with collision kinetic energy and imply the brightest extreme debris disks were made by Mars- to Eart...

  2. Dynamical origin of Theia, the last giant impactor on Earth

    astro-ph.EP 2025-07 conditional novelty 6.0 of 10

    N-body simulations show that a carbonaceous last giant impactor on Earth is dynamically plausible in roughly half of viable mixed embryo-and-planetesimal scenarios.

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