Pluto is no lone ranger in the farthest expanses of the Solar System — its travelling companions now number three. And if Pluto can have so many, why shouldn't other objects in the distant, icy Kuiper belt?
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Binzel, R. Pluto's expanding brood. Nature 439, 924–925 (2006). https://doi.org/10.1038/439924a
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DOI: https://doi.org/10.1038/439924a
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