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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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  • Numerical simulations of a giant impact thought to have formed the Earth-Moon system suggest that over 50 vol% of the Earth's mantle could have melted, indicating a magma ocean to at least 600 km depth.

    “however, numerical simulations of a giant impact thought to have formed the Earth-Moon system suggests that over 50 vol% of the Earth's mantle could have melted, indicating a magma ocean to at least 600 km depth”

    From Secular change and the onset of plate tectonics on Earth (2020) · cites this paper as Canup, 2012

    The paper’s Abstract reports simulations of Moon-forming impacts and says the resulting disks contain 50–90% of their mass in vapor. It does not report that over 50 vol% of Earth’s mantle melted or infer a magma ocean at least 600 km deep (searched: mantle melting, magma ocean, 600 km). The disk-vapor percentage does not establish the claimed mantle-melting percentage. (LLM, conf=0.75)

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Research works printed but not linked: 24

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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 › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › 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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