{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.hypothetical-planet","code":"thing-q1974542","url":"https://ver.cy/models/thing/q1974542/","name":"hypothetical planet","alternateNames":["hypothetic terrestrial planet"],"kind":"thing","status":"published","version":"0.2.0-wave.1","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 planet proposed to exist but not confirmed or later disproved, such as Vulcan inside Mercury orbit, the disrupted Phaeton, the impactor Theia, counter-Earth and the proposed Planet Nine in the outer solar system, as well as exoplanet candidates awaiting confirmation; fictional planets are a separate category.","purpose":"Let an agent handle hypothetical planets by proposal, evidence, status and history, attributing claims to their proponents and separating fiction.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Proposed existence","Status open or disproved","Based on indirect evidence","Often controversial"],"structure":{"bundles":[{"id":"proposal","name":"Proposal","description":"Why proposed.","layers":[{"id":"reason","name":"Reason","description":"Motivation.","findings":[{"id":"reason-finding","name":"Reason","description":"Motivation.","questions":[{"text":"What observations led to this planet being proposed, and by whom?","kind":"provenance"},{"text":"When was it proposed?","kind":"provenance"}]}]},{"id":"status","name":"Status","description":"Current status.","findings":[{"id":"status-finding","name":"Status","description":"Current status.","questions":[{"text":"Is the planet confirmed, still hypothetical or disproved, according to current research?","kind":"provenance"},{"text":"What evidence changed its status?","kind":"provenance"}]}]}]},{"id":"search","name":"Search","description":"Looking for it.","layers":[{"id":"surveys","name":"Surveys","description":"Search efforts.","findings":[{"id":"surveys-finding","name":"Surveys","description":"Surveys.","questions":[{"text":"Which surveys or telescopes are searching for it?","kind":"provenance"},{"text":"What limits have they set?","kind":"measurement"}]}]},{"id":"alternatives","name":"Alternatives","description":"Other explanations.","findings":[{"id":"alternatives-finding","name":"Alternatives","description":"Alternative explanations.","questions":[{"text":"What alternative explanations exist for the observations?","kind":"provenance"},{"text":"Which are favoured?","kind":"boundary"}]}]}]},{"id":"history","name":"History","description":"Past proposals.","layers":[{"id":"vulcan","name":"Vulcan","description":"Disproved planets.","findings":[{"id":"vulcan-finding","name":"Vulcan","description":"Disproved planets.","questions":[{"text":"Why was Vulcan proposed, and how did general relativity explain the anomaly?","kind":"provenance"},{"text":"What other planets were disproved?","kind":"provenance"}]}]},{"id":"theia","name":"Theia","description":"Impactors.","findings":[{"id":"theia-finding","name":"Theia","description":"Hypothetical impactors.","questions":[{"text":"What is the giant impact hypothesis involving Theia?","kind":"provenance"},{"text":"How strong is the evidence?","kind":"boundary"}]}]}]},{"id":"myths","name":"Myths","description":"Pseudoscience and fiction.","layers":[{"id":"doomsday","name":"Doomsday","description":"Nibiru claims.","findings":[{"id":"doomsday-finding","name":"Doomsday","description":"Doomsday claims.","questions":[{"text":"Is there evidence for claims of a rogue planet about to hit Earth?","kind":"boundary"},{"text":"How can the agent explain the scientific position calmly?","kind":"action"}]}]},{"id":"fiction","name":"Fiction","description":"Fictional planets.","findings":[{"id":"fiction-finding","name":"Fiction","description":"Fictional planets.","questions":[{"text":"Is a fictional planet from a book, film or game meant?","kind":"boundary"},{"text":"Which entry fits?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Describe hypothetical planets and the evidence for and against them.","Mark each one as proposed, disproved or a candidate, citing sources."],"mustNot":["Present an unconfirmed planet as real.","Spread doomsday claims about hidden planets colliding with Earth.","Misattribute proposals or discoveries."],"requiresHuman":["Announcing a candidate planet as confirmed."]},"ethics":{"considerations":["False planet scares cause real fear, especially among young people."],"affectedParties":["The public","Students","Researchers"]},"owners":{"steward":"Nobody: hypotheses held in common by the scientific community.","roles":[],"masterSystems":[]},"relations":[{"target":"Q5961257","type":"parent","note":"registry parent class"},{"target":"hypothetical astronomical object","type":"related","note":"category"},{"target":"Planet Nine","type":"related","note":"example"},{"target":"Chthonian planet","type":"related","note":"hypothetical class"},{"target":"fictional planet","type":"related","note":"related category"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.hypothetical-planet","Wikidata: Q1974542 (https://www.wikidata.org/wiki/Q1974542)"]},"properties":{"applicability":"required","items":["Proposed mass:  kg - Mass is constrained through dynamical models or observational limits, with estimates remaining conditional on the proposed body's existence.","Proposed radius:  km - Radius is inferred from candidate observations or physical models and must be distinguished from a confirmed measurement.","Proposed orbital period:  days - Orbital period is estimated from candidate orbital solutions or assumed orbital parameters and the mass of the central body."]},"recognition":{"applicability":"required","items":["Proposed but unconfirmed planets","Historical predictions such as Vulcan","Confirmed exoplanets are observed","Not observed or not confirmed; appears in models, predictions and historical records."]},"capabilities":{"applicability":"required","items":["explain why a planet was proposed","report its current status with sources","summarise searches and evidence","separate fictional planets"]},"hazards":{"applicability":"required","items":["Presenting proposals as discoveries","Pseudoscientific doomsday claims such as Nibiru"]},"interfaces":{"applicability":"required","items":["IAU planet definitions","Exoplanet confirmation criteria of catalogues"]},"context":{"applicability":"required","items":["History of astronomy and current research questions.","disproved historical planets","proposed outer solar system planets","hypothetical impactors","exoplanet candidates","hypothetical planet classes"]}},"sources":[{"title":"Wikidata item Q1974542: hypothetical planet","url":"https://www.wikidata.org/wiki/Q1974542","note":"identity and sense of the item"},{"title":"Wikipedia: Hypothetical planet","url":"https://en.wikipedia.org/wiki/Hypothetical_planet","note":"general description of the item"}],"openQuestions":["Should each proposal be a separate entry?","How should status changes be tracked?","How should fiction be split off?"],"resources":{"spec":"/models/things/publications/thing-q1974542/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1974542/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T13:55:32Z","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 2026-10-07T10:10:28+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}