The existence of a unique binary object captured in the Jovian Trojan population requires an early migration of the giant planets.
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Pike, R. When did the planets migrate?. Nat Astron 2, 858–859 (2018). https://doi.org/10.1038/s41550-018-0628-4
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DOI: https://doi.org/10.1038/s41550-018-0628-4
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