An analysis of hundreds of star-grazing comets in a young planetary system shows that they form two families: a group of old, dried-out comets and a younger group probably related to the break-up of a larger planetary body. See Letter p.462
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Roberge, A. Hurling comets around a planetary nursery. Nature 514, 440–441 (2014). https://doi.org/10.1038/514440a
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DOI: https://doi.org/10.1038/514440a
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