An ingenious way of measuring the ages of stellar populations in the halo of the Milky Way will allow astronomers to obtain direct information on the timing of the Galaxy's evolution.
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Beers, T. Young dwarfs date an old halo. Nature 486, 38–40 (2012). https://doi.org/10.1038/nature11197
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DOI: https://doi.org/10.1038/nature11197