Observations of the distant dwarf planet Haumea constrain its size, shape and density, and reveal an encircling planetary ring. The discovery suggests that rings are not as rare in the Solar System as previously thought. See Letter p.219
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Sickafoose, A. Ring detected around a dwarf planet. Nature 550, 197–198 (2017). https://doi.org/10.1038/550197a
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DOI: https://doi.org/10.1038/550197a
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