Distant planetoid may have pitch-black partner.
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References
WickramasingheJ. T., WickramasingheN. C. & NapierW. M. . Observatory, 124. 300 - 302 (2004).
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Hopkin, M. Sedna 'has invisible moon'. Nature (2004). https://doi.org/10.1038/news040823-3
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DOI: https://doi.org/10.1038/news040823-3