Astronomers would be expected to recognize comets easily when they see them, not least because of the objects' bright tails. But when planetary accidents try to fool them, their job is no longer that simple. See Letters p.814 & p.817
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Nesvorný, D. Accidental investigation. Nature 467, 792–793 (2010). https://doi.org/10.1038/467792a
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DOI: https://doi.org/10.1038/467792a