{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.synestia","code":"thing-q30916732","url":"https://ver.cy/models/thing/q30916732/","name":"Synestia","alternateNames":[],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.SPC"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A hypothesised rapidly rotating, doughnut-shaped mass of vaporised and molten rock proposed to form after a high-energy giant impact between planet-sized bodies, extending beyond the point where it could rotate as a solid body; synestias were proposed in 2017 as a possible stage in the formation of the Moon and remain a theoretical model.","purpose":"Let an agent explain the synestia hypothesis, its physical basis and role in Moon formation models, with attribution and clear statement of its theoretical status.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Post-impact structure","Rotates faster than a solid body limit","Short-lived","Theoretical"],"structure":{"bundles":[{"id":"idea","name":"Idea","description":"The proposal.","layers":[{"id":"physics","name":"Physics","description":"How it forms.","findings":[{"id":"physics-finding","name":"Physics","description":"Physics.","questions":[{"text":"How would a giant impact produce a synestia, according to the proposing researchers?","kind":"provenance"},{"text":"Who proposed it, and when?","kind":"provenance"}]}]},{"id":"status","name":"Status","description":"Hypothetical.","findings":[{"id":"status-finding","name":"Status","description":"Status.","questions":[{"text":"Is the synestia an observed object or a theoretical model?","kind":"boundary"},{"text":"How is it presented in the literature?","kind":"provenance"}]}]}]},{"id":"moon","name":"Moon","description":"Moon formation.","layers":[{"id":"role","name":"Role","description":"In lunar origin.","findings":[{"id":"role-finding","name":"Role","description":"Lunar origin.","questions":[{"text":"How does the synestia model explain the Moon composition and its similarity to Earth?","kind":"provenance"},{"text":"How does it differ from the classic giant impact model?","kind":"definition"}]}]},{"id":"evidence","name":"Evidence","description":"Tests.","findings":[{"id":"evidence-finding","name":"Evidence","description":"Evidence.","questions":[{"text":"What isotopic and chemical evidence do the models seek to explain?","kind":"provenance"},{"text":"Which observations could distinguish them?","kind":"provenance"}]}]}]},{"id":"properties","name":"Properties","description":"Modelled features.","layers":[{"id":"structure","name":"Structure","description":"Shape and rotation.","findings":[{"id":"structure-finding","name":"Structure","description":"Structure.","questions":[{"text":"What structure, temperature and rotation do simulations give a synestia?","kind":"provenance"},{"text":"How long would it last?","kind":"measurement"}]}]},{"id":"elsewhere","name":"Elsewhere","description":"Other systems.","findings":[{"id":"elsewhere-finding","name":"Elsewhere","description":"Other systems.","questions":[{"text":"Could synestias occur in other planetary systems, and could they be observed?","kind":"provenance"},{"text":"What would they look like?","kind":"provenance"}]}]}]},{"id":"learn","name":"Learn","description":"Explaining.","layers":[{"id":"explain","name":"Explain","description":"Plain language.","findings":[{"id":"explain-finding","name":"Explain","description":"Plain explanation.","questions":[{"text":"How can the synestia idea be explained simply while noting its status?","kind":"action"},{"text":"Which images or models help?","kind":"action"}]}]},{"id":"sources","name":"Sources","description":"Papers.","findings":[{"id":"sources-finding","name":"Sources","description":"Papers.","questions":[{"text":"Which papers introduced and developed the synestia model?","kind":"provenance"},{"text":"Which reviews assess it?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Explain the synestia hypothesis and its role in theories of the Moon's formation, citing the research.","State that synestias are hypothesised and have not been observed."],"mustNot":["Present the synestia as observed or established fact.","Misattribute the hypothesis or its results to the wrong researchers.","Present competing models of Moon formation as disproved without evidence."],"requiresHuman":["Publishing educational material that ranks competing scientific hypotheses."]},"ethics":{"considerations":["Honest presentation of hypotheses protects public trust in science."],"affectedParties":["Students and readers","Researchers whose work is cited"]},"owners":{"steward":"Nobody owns the idea; it belongs to planetary science.","roles":[],"masterSystems":[]},"relations":[{"target":"Q5961257","type":"parent","note":"registry parent class"},{"target":"hypothetical astronomical object","type":"related","note":"category"},{"target":"Moon formation theory","type":"related","note":"context"},{"target":"eyeball planet","type":"related","note":"other hypothetical object"},{"target":"celestial body","type":"related","note":"broader class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.synestia","Wikidata: Q30916732 (https://www.wikidata.org/wiki/Q30916732)"]},"properties":{"applicability":"required","items":["Total mass:  kilograms - Infer total mass from the material represented in an impact simulation because synestias have not been directly measured.","Radial extent:  kilometres - Determine radial extent from a simulation using an explicitly stated boundary criterion for the diffuse outer material.","Temperature:  kelvin - Calculate the spatial temperature distribution using the simulation's thermodynamic model rather than assuming a uniform temperature.","Angular velocity:  radians per second - Derive angular velocity as a function of position from simulated motion because the structure does not rotate as a single rigid body."]},"recognition":{"applicability":"required","items":["Rapidly rotating vaporised rock structure","Product of a giant impact in simulations","A protoplanetary disc is gas and dust around a young star","Not observed; modelled as a glowing, puffed, doughnut-shaped structure of vaporised rock."]},"capabilities":{"applicability":"required","items":["explain what a synestia is","describe its role in Moon formation models","compare with other giant impact models","clarify hypothetical status"]},"hazards":{"applicability":"required","items":["Presenting the model as established","Confusing with discs or nebulae"]},"interfaces":{"applicability":"required","items":["No regulation"]},"context":{"applicability":"required","items":["Planetary science and theories of Moon formation.","synestias in Moon formation models","synestias in exoplanet impact models","related post-impact discs and structures"]}},"sources":[{"title":"Wikidata item Q30916732: Synestia","url":"https://www.wikidata.org/wiki/Q30916732","note":"identity and sense of the item"},{"title":"Wikipedia: Synestia","url":"https://en.wikipedia.org/wiki/Synestia","note":"general description of the item"}],"openQuestions":["Should Moon formation be a separate entry?","How should simulation papers be linked?","How should competing models be attributed?"],"resources":{"spec":"/models/things/publications/thing-q30916732/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q30916732/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T19:52:27Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:29+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}