A giant impact on the young proto-Earth is thought to explain the formation of the Moon. High-precision analysis of titanium isotopes in lunar rocks suggests that the Moon and Earth's mantle are more similar than existing models permit.
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Meier, M. Earth's titanium twin. Nature Geosci 5, 240–241 (2012). https://doi.org/10.1038/ngeo1434
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DOI: https://doi.org/10.1038/ngeo1434
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