{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f2dad727f938acd14add7277962a152e0ce3c6da841f16a9370ba89229b69370","created":"2026-10-03T07:18:03Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1b8b38b3ff132cc742a355a60488498747933a15771a06b2bdbb7b9f83ebedd3","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"earth.solar-system-dynamics.kuiper-belt-structure","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"The Kuiper belt, the ring of icy bodies beyond Neptune, contains a calm population on nearly circular orbits, a stirred-up population and bodies locked in step with Neptune. Which migration history of Neptune produced this mix is not settled.","posed_since":"","precise":"Find the Neptune migration history (speed, smoothness or graininess, eccentricity excitation) and primordial disk profile that together reproduce the cold classical belt at about 42 to 47 au with its kernel near 44 au, the hot population inclination distribution (up to about 30 degrees), the resonant populations and the outer edge near 48 au. An answer is a model fitting debiased survey distributions.","problem_ref":null,"references":"","settled_by":"Numerical migration models compared through survey simulators with debiased orbital distributions from well-characterized surveys, excluding competing histories.","status_note":"","title":"How did Neptune's migration shape the structure of the Kuiper 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