Cited by 656Astro and Planetary SciencePlanetary Science and ExplorationHistory and Developments in Astronomy

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Forming a Moon with an Earth-like Composition via a Giant Impact

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Canup, Robin M.·2012·Science

Abstract

Forming the Moon from Earth It is thought that the Moon formed after a Mars-sized planet hit Earth about 4.5 billion years ago. Computer simulations of this event predict that the Moon was produced primarily from material from the impacting planet. However, the Moon has a similar composition to that of Earth, and the impacting planet would likely have had a different composition. Prior models assumed that the impact left the Earth-Moon system with the same angular momentum as it has today (see the Perspective by Halliday ). Ćuk and Stewart (p. 1047 , published online 17 October; see the cover) show that the angular momentum of the Earth-Moon system could have decreased by half after the Moon-forming impact, opening the door to new impact models. For example, simulations suggest that high-velocity impacts onto a fast-spinning early Earth can lead to a Moon formed primarily from Earth's mantle. Canup (p. 1052 , published online 17 October) considered instead lower-velocity impacts by planets comparable in mass to the proto-Earth, which could generate a Moon and an Earth with similar compositions.

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  1. J. A. Wood in Origin of the Moon W. K. Hartmann R. J. Phillips G. J. Taylor Eds. (LPI Houston 1984) pp. 17–55.

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Metadata

Authors
Canup, R. M.
Affiliations
Southwest Research Institute (US)
Corresponding author
Canup, Robin M.
Venue
Science
Published
2012-11-23
Volume
338
Issue
6110
Pages
1052-1055
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2156821519
Cited by
656
References
30
Citations by year
2026: 32 · 2025: 39 · 2024: 48 · 2023: 76 · 2022: 41 · 2021: 62 · 2020: 44 · 2019: 48 · 2018: 41 · 2017: 53 · 2016: 43 · 2015: 44 · 2014: 56 · 2013: 24 · 2012: 3
FWCI
22.24
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Aeronautics and Space Administration (NNX13AJ66G)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
  • Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Planetary Science and Exploration
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › History and Developments in Astronomy
Keywords
Moon formation, giant impacts, Earth-Moon system, angular momentum, impact velocity, Earth's mantle, Moon composition, impact simulation

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