Competing teams spy objects on fringe of Solar System.
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References
BrownM. E., et al., preprint available online at http://www.gps.caltech.edu/ %7Embrown/papers/ps/EL61.pdf (2005).
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Jose-Luiz Ortiz's 2003 EL61 page
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Peplow, M. Santa and little helper seen beyond Pluto. Nature (2005). https://doi.org/10.1038/news050725-13
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DOI: https://doi.org/10.1038/news050725-13