Fresh evidence shows that the iron isotopic composition of Earth's silicate component does not, as was previously thought, reflect the formation of the planet's core at high pressure nor losses of material to space.
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Halliday, A. Small differences in sameness. Nature 497, 43–45 (2013). https://doi.org/10.1038/497043a
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DOI: https://doi.org/10.1038/497043a