Elements heavier than helium are synthesized in stars. But could there be stars, created soon after the Big Bang, that contain almost no heavy elements? The discovery of such a star gives new clues to this early time.
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Pilachowski, C. Relic of the dawn of time. Nature 419, 886–887 (2002). https://doi.org/10.1038/419886a
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DOI: https://doi.org/10.1038/419886a