{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.megastructure","code":"thing-q957798","url":"https://ver.cy/models/thing/q957798/","name":"megastructure","alternateNames":["artificial world","shellworld","Topopolis","Intercontinental and transoceanic fixed links"],"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":"An extremely large artificial structure; in engineering, record-scale constructions such as long fixed links and very large buildings, and in speculative science and fiction, hypothetical astronomical structures such as Dyson spheres, ringworlds and shellworlds.","purpose":"Let an agent handle megastructures by type, real or hypothetical status, scale and feasibility, clearly separating built works from speculation.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Extreme scale","Mix of real and speculative","Feasibility often unknown","Popular in science fiction"],"structure":{"bundles":[{"id":"status","name":"Status","description":"Real or hypothetical.","layers":[{"id":"built","name":"Built","description":"Real structures.","findings":[{"id":"built-finding","name":"Built","description":"Built status.","questions":[{"text":"Is this megastructure built, under construction or hypothetical?","kind":"boundary"},{"text":"Which source confirms it?","kind":"provenance"}]}]},{"id":"concept","name":"Concept","description":"Origin of idea.","findings":[{"id":"concept-finding","name":"Concept","description":"Concept origin.","questions":[{"text":"Who proposed the concept and when?","kind":"provenance"},{"text":"Is it from science or fiction?","kind":"boundary"}]}]}]},{"id":"scale","name":"Scale","description":"Size.","layers":[{"id":"dimensions","name":"Dimensions","description":"Size.","findings":[{"id":"dimensions-finding","name":"Dimensions","description":"Dimensions.","questions":[{"text":"What are its dimensions?","kind":"measurement"},{"text":"How does it compare with other structures?","kind":"measurement"}]}]},{"id":"resources","name":"Resources","description":"Materials and energy.","findings":[{"id":"resources-finding","name":"Resources","description":"Resources.","questions":[{"text":"What materials and energy would it require?","kind":"measurement"},{"text":"Are the estimates sourced?","kind":"provenance"}]}]}]},{"id":"feasibility","name":"Feasibility","description":"Could it work.","layers":[{"id":"physics","name":"Physics","description":"Constraints.","findings":[{"id":"physics-finding","name":"Physics","description":"Physical constraints.","questions":[{"text":"What physical constraints apply, such as stability or strength?","kind":"definition"},{"text":"Which analyses address them?","kind":"provenance"}]}]},{"id":"search","name":"Search","description":"Technosignatures.","findings":[{"id":"search-finding","name":"Search","description":"Technosignature searches.","questions":[{"text":"Have astronomers searched for such structures?","kind":"provenance"},{"text":"Are any claims confirmed?","kind":"boundary"}]}]}]},{"id":"culture","name":"Culture","description":"Fiction.","layers":[{"id":"works","name":"Works","description":"Books and games.","findings":[{"id":"works-finding","name":"Works","description":"Fictional works.","questions":[{"text":"Which works feature this megastructure?","kind":"provenance"},{"text":"How is it depicted?","kind":"definition"}]}]},{"id":"projects","name":"Projects","description":"Real megaprojects.","findings":[{"id":"projects-finding","name":"Projects","description":"Real projects.","questions":[{"text":"Which real projects are proposed at similar scale?","kind":"provenance"},{"text":"What is their status?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Report the dimensions, cost and status of built record-scale structures from official sources.","Clearly separate engineering fact from speculative or fictional megastructures."],"mustNot":["Present a speculative or fictional megastructure as a real or planned project.","Claim a technosignature detection that the astronomical community has not confirmed.","Give structural design figures for a real project without a qualified engineer.","Omit the displacement and environmental effects when describing a megaproject."],"requiresHuman":["Any engineering judgement used in the design or approval of a real structure."]},"ethics":{"considerations":["Megaprojects displace communities and reshape environments, which belongs in any honest account.","Unconfirmed claims about alien megastructures erode trust in science reporting."],"affectedParties":["Communities displaced by megaprojects","Construction workers","Readers of science news"]},"owners":{"steward":"The owner and the engineer of record for a built structure; nobody owns the speculative concept.","roles":[],"masterSystems":["National infrastructure project records"]},"relations":[{"target":"Q5961257","type":"parent","note":"registry parent class"},{"target":"Q8205328","type":"parent","note":"registry parent class"},{"target":"artificial physical object","type":"related","note":"category"},{"target":"Dyson sphere","type":"related","note":"hypothetical"},{"target":"megaproject","type":"related","note":"planning"},{"target":"technosignature","type":"related","note":"astronomy"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.megastructure","Wikidata: Q957798 (https://www.wikidata.org/wiki/Q957798)"]},"properties":{"applicability":"required","items":["Maximum overall dimension:  m - Determine the greatest extent from surveys or design geometry and distinguish measured dimensions from hypothetical ones.","Structural mass:  kg - Determine mass from material quantities and densities while stating which structural components are included.","Occupied volume:  m3 - Calculate volume from surveyed or proposed geometry using an explicit boundary convention."]},"recognition":{"applicability":"required","items":["Built versus hypothetical","Concepts such as Dyson sphere or O Neill cylinder","Megaprojects are a related planning term","Built examples: huge bridges, tunnels and dams; hypothetical ones exist only as concepts and art."]},"capabilities":{"applicability":"required","items":["distinguish built megastructures from hypothetical ones","compare scale and feasibility","find sources for real projects","discuss technosignature searches"]},"hazards":{"applicability":"required","items":["Presenting speculation as fact","Claiming technosignature detections without confirmation"]},"interfaces":{"applicability":"required","items":["Engineering codes for built structures","Outer Space Treaty for space activities"]},"context":{"applicability":"required","items":["Discussing very large engineering and speculative astroengineering.","intercontinental and transoceanic fixed links","very large buildings and dams","Dyson spheres and swarms","ringworlds and topopolises","space habitats"]}},"sources":[{"title":"Wikidata item Q957798: megastructure","url":"https://www.wikidata.org/wiki/Q957798","note":"identity and sense of the item"},{"title":"Wikipedia: Megastructure","url":"https://en.wikipedia.org/wiki/Megastructure","note":"general description of the item"}],"openQuestions":["Should built and hypothetical megastructures be separate entries?","How should concept sources be cited?","How should technosignature searches be linked?"],"resources":{"spec":"/models/things/publications/thing-q957798/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q957798/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T09:42:29Z","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 2026-10-07T10:10:33+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}