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We estimate this event occurred between 600 and 1,200 years ago, a temporal window that notably coincides with a period of abrupt orbital changes caused by multiple close encounters with Jupiter."},{"attestation":"unclaimed","claim_id":"C2","kind":"weakest_assumption","source":"verdict.weakest_assumption","status":"machine_extracted","text":"The assumption that the orbital changes from Jupiter encounters directly triggered the mass flow (rather than coincidence or an unrelated internal process) and that the simulations capture the actual flow mechanics without unstated parameters or post-hoc tuning; this premise enters in the chronology and triggering discussion after the simulation results are presented."},{"attestation":"unclaimed","claim_id":"C3","kind":"one_line_summary","source":"verdict.one_line_summary","status":"machine_extracted","text":"A single mass flow event 600-1200 years ago formed the large smooth patch on comet 9P/Tempel 1, possibly triggered by Jupiter close encounters."},{"attestation":"unclaimed","claim_id":"C4","kind":"headline","source":"verdict.pith_extraction.headline","status":"machine_extracted","text":"A single gravitational flow event 600 to 1200 years ago formed the large smooth patch on comet 9P/Tempel 1 along with nearby terraces and other smooth units."}],"snapshot_sha256":"304b495e56ef68781fbcd4e79b6f3f5ca6f78767983ea19475c7c4f4d998c1f5"},"formal_canon":{"evidence_count":2,"snapshot_sha256":"1ac1f82d973cf981e85575a39d496fe23e9dae190362f94c06923be577d47ac1"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2411.01997/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a comprehensive reassessment of the region containing the large smooth patch on comet 9P/Tempel 1, leveraging data from the Deep Impact and Stardust-NExT missions, an updated stereophotoclinometry-based shape model, and numerical simulations. The study seeks to understand the nature, the triggering mechanism, and the chronology of this distinctive feature. Morphological and spectral analysis reveals that the smooth patch has a thickness of approximately 25 meters, a notable lobate U-shape, and a spectral composition indistinguishable from the surrounding terrain, which favors an end","authors_text":"J. Kloos, J. L. Ortiz, J. L. Rizos, J. M. Sunshine, T. L. Farnham","cross_cats":[],"headline":"A single gravitational flow event 600 to 1200 years ago formed the large smooth patch on comet 9P/Tempel 1 along with nearby terraces and other smooth units.","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2024-11-04T11:33:34Z","title":"The Large Smooth Patch on Comet 9P/Tempel 1: Remnant of a Recent Past Event"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2411.01997","kind":"arxiv","version":4},"verdict":{"created_at":"2026-05-23T17:45:08.479684Z","id":"3831f90c-a45d-4f19-8727-5564bb245bd7","model_set":{"reader":"grok-4.3"},"one_line_summary":"A single mass flow event 600-1200 years ago formed the large smooth patch on comet 9P/Tempel 1, possibly triggered by Jupiter close encounters.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"A single gravitational flow event 600 to 1200 years ago formed the large smooth patch on comet 9P/Tempel 1 along with nearby terraces and other smooth units.","strongest_claim":"Gravitational flow simulations demonstrate that a single event could have formed the large smooth patch, the secondary smooth units observed on other faces of the comet, and the topographic terrace features adjacent to the northern smooth unit. 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