Optical and infrared observations of a bright object in the outer Solar System reveal it to be surprisingly large — almost as big as Pluto's moon. It could be the first of many such discoveries.
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Tegler, S., Romanishin, W. Almost Planet X. Nature 411, 423–424 (2001). https://doi.org/10.1038/35078164
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DOI: https://doi.org/10.1038/35078164