Nature Astronomy, Published online: 18 December 2024; doi:10.1038/s41550-024-02450-1

A new study shows that many ‘ultra-wide’ binaries (UWBs) in the Kuiper belt are not primordial but attained their present large separations during multiple encounters with other trans-Neptunian objects, and constrain Solar System formation and evolution differently than previously thought.

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