The relative abundances of magnesium isotopes in the Allende meteorite reveal the precise chronology of the early Solar System — a geochemical second hand on the clock of creation.
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Halliday, A. The clock's second hand. Nature 431, 253–254 (2004). https://doi.org/10.1038/431253a
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DOI: https://doi.org/10.1038/431253a
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