{
  "summary": {
    "generatedAt": "2026-06-05T08:39:22.040213+00:00",
    "catalogType": "Noble conceptual construction and settlement model",
    "observedConfirmedAlienMegastructures": 0,
    "conceptualMegastructureRecords": 1996,
    "currentPermanentSettlersBeyondEarthOrbit2026": 0,
    "note": "Present-day settlement counts are factual zero values for Moon, Mars, Proxima and exoplanets. Future populations are scenario-model values, not observed facts.",
    "sourceContext": [
      "NASA Exoplanet Archive for confirmed exoplanet context",
      "NASA Astrobiology ESI notes for the limitations of Earth Similarity Index",
      "Noble internal O'Neill/Dyson construction model for conceptual design records"
    ]
  },
  "settlementPrograms": [
    {
      "destination": "Moon settlement",
      "currentPermanentSettlers2026": 0,
      "distance": "384,400 km average from Earth",
      "firstOperationalWindow": "2030s, scenario-dependent",
      "model": [
        {
          "year": 2026,
          "settlers": 0,
          "status": "No permanent settlement"
        },
        {
          "year": 2035,
          "settlers": 12,
          "status": "Polar pilot base scenario"
        },
        {
          "year": 2045,
          "settlers": 260,
          "status": "Industrial oxygen, water and construction pilot"
        },
        {
          "year": 2060,
          "settlers": 4200,
          "status": "Permanent multi-site surface settlement"
        },
        {
          "year": 2100,
          "settlers": 82000,
          "status": "Cislunar logistics and manufacturing economy"
        }
      ]
    },
    {
      "destination": "Mars settlement",
      "currentPermanentSettlers2026": 0,
      "distance": "54.6 to 401 million km from Earth",
      "firstOperationalWindow": "2040s, scenario-dependent",
      "model": [
        {
          "year": 2026,
          "settlers": 0,
          "status": "No permanent settlement"
        },
        {
          "year": 2040,
          "settlers": 8,
          "status": "First surface continuity scenario"
        },
        {
          "year": 2055,
          "settlers": 180,
          "status": "Closed-loop habitat and ISRU pilot"
        },
        {
          "year": 2075,
          "settlers": 9500,
          "status": "Regional settlement network"
        },
        {
          "year": 2120,
          "settlers": 240000,
          "status": "Multi-city terraforming-support industry"
        }
      ]
    },
    {
      "destination": "O'Neill Dyson swarm orbital habitats",
      "currentPermanentSettlers2026": 0,
      "distance": "Earth orbit to solar system industrial swarm",
      "firstOperationalWindow": "2050s for first large free-space habitat scenario",
      "model": [
        {
          "year": 2026,
          "settlers": 0,
          "status": "No O'Neill settlement exists"
        },
        {
          "year": 2050,
          "settlers": 1200,
          "status": "First rotating habitat demonstrator scenario"
        },
        {
          "year": 2075,
          "settlers": 180000,
          "status": "Cislunar cylinder and mirror farm network"
        },
        {
          "year": 2125,
          "settlers": 18500000,
          "status": "Dyson swarm industrial expansion scenario"
        },
        {
          "year": 2200,
          "settlers": 1300000000,
          "status": "Mature multi-orbit habitat economy scenario"
        }
      ]
    },
    {
      "destination": "Proxima Centauri b mission architecture",
      "currentPermanentSettlers2026": 0,
      "distance": "4.24 light-years",
      "firstOperationalWindow": "22nd century probe; settlement only as speculative far-future model",
      "model": [
        {
          "year": 2026,
          "settlers": 0,
          "status": "No interstellar settlement"
        },
        {
          "year": 2080,
          "settlers": 0,
          "status": "High-velocity precursor probe scenario"
        },
        {
          "year": 2140,
          "settlers": 0,
          "status": "Arrival science relay scenario if launched earlier"
        },
        {
          "year": 2250,
          "settlers": 120,
          "status": "Speculative robotic-assisted outpost scenario"
        },
        {
          "year": 2400,
          "settlers": 9000,
          "status": "Speculative settlement continuity scenario"
        }
      ]
    }
  ],
  "exoplanetTargets": [
    {
      "target": "Teegarden's Star b",
      "distanceLightYears": 12.5,
      "esiApprox": 0.95,
      "priority": "nearby ESI-oriented candidate",
      "note": "ESI is a similarity index, not proof of habitability."
    },
    {
      "target": "TRAPPIST-1e",
      "distanceLightYears": 40.7,
      "esiApprox": 0.91,
      "priority": "rocky habitable-zone target with strong observability interest",
      "note": "Tidally locked M-dwarf system; atmosphere status remains research-dependent."
    },
    {
      "target": "TOI-700 d/e system",
      "distanceLightYears": 101.4,
      "esiApprox": 0.9,
      "priority": "nearby TESS habitable-zone system",
      "note": "Use as target family for future spectroscopy and settlement modeling."
    },
    {
      "target": "Kepler-442b",
      "distanceLightYears": 1193,
      "esiApprox": 0.84,
      "priority": "frequently cited rocky habitable-zone candidate",
      "note": "Distance makes settlement a far-future reference architecture only."
    }
  ],
  "megastructureCatalog": [
    {
      "id": "NFAG-MEGA-0001",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "concept",
      "radiusKm": 8.0,
      "lengthKm": 32.0,
      "populationCapacity": 420000,
      "energyGW": 4.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0002",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "simulation",
      "radiusKm": 0.66,
      "lengthKm": 1.98,
      "populationCapacity": 132,
      "energyGW": 5.5,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0003",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "materials study",
      "radiusKm": 1.44,
      "lengthKm": 1.44,
      "populationCapacity": 10800,
      "energyGW": 7.2,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0004",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "robotic precursor",
      "radiusKm": 2.34,
      "lengthKm": 0.26,
      "populationCapacity": 18200,
      "energyGW": 9.1,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0005",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "industrial design",
      "radiusKm": 3.36,
      "lengthKm": 0.06,
      "populationCapacity": 0,
      "energyGW": 11.2,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0006",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "concept",
      "radiusKm": 0.12,
      "lengthKm": 27.0,
      "populationCapacity": 120,
      "energyGW": 13.5,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0007",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "simulation",
      "radiusKm": 6.4,
      "lengthKm": 1.12,
      "populationCapacity": 4160,
      "energyGW": 16.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0008",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "materials study",
      "radiusKm": 1.53,
      "lengthKm": 4.42,
      "populationCapacity": 1190,
      "energyGW": 18.7,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0009",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "robotic precursor",
      "radiusKm": 14.4,
      "lengthKm": 57.6,
      "populationCapacity": 756000,
      "energyGW": 21.6,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0010",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "industrial design",
      "radiusKm": 1.14,
      "lengthKm": 3.42,
      "populationCapacity": 228,
      "energyGW": 24.7,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0011",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "concept",
      "radiusKm": 2.4,
      "lengthKm": 2.4,
      "populationCapacity": 18000,
      "energyGW": 28.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0012",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "simulation",
      "radiusKm": 3.78,
      "lengthKm": 0.42,
      "populationCapacity": 29400,
      "energyGW": 31.5,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0013",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "materials study",
      "radiusKm": 5.28,
      "lengthKm": 0.09,
      "populationCapacity": 0,
      "energyGW": 35.2,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0014",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "robotic precursor",
      "radiusKm": 0.18,
      "lengthKm": 41.4,
      "populationCapacity": 184,
      "energyGW": 39.1,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0015",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "industrial design",
      "radiusKm": 9.6,
      "lengthKm": 1.68,
      "populationCapacity": 6240,
      "energyGW": 43.2,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0016",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "concept",
      "radiusKm": 2.25,
      "lengthKm": 6.5,
      "populationCapacity": 1750,
      "energyGW": 47.5,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0017",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "simulation",
      "radiusKm": 20.8,
      "lengthKm": 83.2,
      "populationCapacity": 1092000,
      "energyGW": 52.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0018",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "materials study",
      "radiusKm": 1.62,
      "lengthKm": 4.86,
      "populationCapacity": 324,
      "energyGW": 56.7,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0019",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "robotic precursor",
      "radiusKm": 3.36,
      "lengthKm": 3.36,
      "populationCapacity": 25200,
      "energyGW": 61.6,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0020",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "industrial design",
      "radiusKm": 5.22,
      "lengthKm": 0.58,
      "populationCapacity": 40600,
      "energyGW": 66.7,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0021",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "concept",
      "radiusKm": 7.2,
      "lengthKm": 0.12,
      "populationCapacity": 0,
      "energyGW": 72.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0022",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "simulation",
      "radiusKm": 0.25,
      "lengthKm": 55.8,
      "populationCapacity": 248,
      "energyGW": 77.5,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0023",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "materials study",
      "radiusKm": 12.8,
      "lengthKm": 2.24,
      "populationCapacity": 8320,
      "energyGW": 83.2,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0024",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "robotic precursor",
      "radiusKm": 2.97,
      "lengthKm": 8.58,
      "populationCapacity": 2310,
      "energyGW": 89.1,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0025",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "industrial design",
      "radiusKm": 27.2,
      "lengthKm": 108.8,
      "populationCapacity": 1428000,
      "energyGW": 95.2,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0026",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "concept",
      "radiusKm": 2.1,
      "lengthKm": 6.3,
      "populationCapacity": 420,
      "energyGW": 101.5,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0027",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "simulation",
      "radiusKm": 4.32,
      "lengthKm": 4.32,
      "populationCapacity": 32400,
      "energyGW": 108.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0028",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "materials study",
      "radiusKm": 6.66,
      "lengthKm": 0.74,
      "populationCapacity": 51800,
      "energyGW": 114.7,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0029",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "robotic precursor",
      "radiusKm": 9.12,
      "lengthKm": 0.15,
      "populationCapacity": 0,
      "energyGW": 121.6,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0030",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "industrial design",
      "radiusKm": 0.08,
      "lengthKm": 18.0,
      "populationCapacity": 80,
      "energyGW": 33.0,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0031",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "concept",
      "radiusKm": 4.4,
      "lengthKm": 0.77,
      "populationCapacity": 2860,
      "energyGW": 37.4,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0032",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "simulation",
      "radiusKm": 1.08,
      "lengthKm": 3.12,
      "populationCapacity": 840,
      "energyGW": 42.0,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0033",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "materials study",
      "radiusKm": 10.4,
      "lengthKm": 41.6,
      "populationCapacity": 546000,
      "energyGW": 46.8,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0034",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "robotic precursor",
      "radiusKm": 0.84,
      "lengthKm": 2.52,
      "populationCapacity": 168,
      "energyGW": 51.8,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0035",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "industrial design",
      "radiusKm": 1.8,
      "lengthKm": 1.8,
      "populationCapacity": 13500,
      "energyGW": 57.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0036",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "concept",
      "radiusKm": 2.88,
      "lengthKm": 0.32,
      "populationCapacity": 22400,
      "energyGW": 62.4,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0037",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "simulation",
      "radiusKm": 4.08,
      "lengthKm": 0.07,
      "populationCapacity": 0,
      "energyGW": 68.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0038",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "materials study",
      "radiusKm": 0.14,
      "lengthKm": 32.4,
      "populationCapacity": 144,
      "energyGW": 73.8,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0039",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "robotic precursor",
      "radiusKm": 7.6,
      "lengthKm": 1.33,
      "populationCapacity": 4940,
      "energyGW": 79.8,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0040",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "industrial design",
      "radiusKm": 1.8,
      "lengthKm": 5.2,
      "populationCapacity": 1400,
      "energyGW": 86.0,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0041",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "concept",
      "radiusKm": 16.8,
      "lengthKm": 67.2,
      "populationCapacity": 882000,
      "energyGW": 92.4,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0042",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "simulation",
      "radiusKm": 1.32,
      "lengthKm": 3.96,
      "populationCapacity": 264,
      "energyGW": 99.0,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0043",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "materials study",
      "radiusKm": 2.76,
      "lengthKm": 2.76,
      "populationCapacity": 20700,
      "energyGW": 105.8,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0044",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "robotic precursor",
      "radiusKm": 4.32,
      "lengthKm": 0.48,
      "populationCapacity": 33600,
      "energyGW": 112.8,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0045",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "industrial design",
      "radiusKm": 6.0,
      "lengthKm": 0.1,
      "populationCapacity": 0,
      "energyGW": 120.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0046",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "concept",
      "radiusKm": 0.21,
      "lengthKm": 46.8,
      "populationCapacity": 208,
      "energyGW": 127.4,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0047",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "simulation",
      "radiusKm": 10.8,
      "lengthKm": 1.89,
      "populationCapacity": 7020,
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      "id": "NFAG-MEGA-0048",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "id": "NFAG-MEGA-0104",
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-0105",
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      "id": "NFAG-MEGA-0106",
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    {
      "id": "NFAG-MEGA-0224",
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    {
      "id": "NFAG-MEGA-0225",
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    {
      "id": "NFAG-MEGA-0226",
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    {
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    {
      "id": "NFAG-MEGA-0228",
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      "id": "NFAG-MEGA-0230",
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    {
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    {
      "id": "NFAG-MEGA-0232",
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      "id": "NFAG-MEGA-0240",
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    {
      "id": "NFAG-MEGA-0250",
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    {
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
      "id": "NFAG-MEGA-0255",
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    {
      "id": "NFAG-MEGA-0256",
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    {
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    {
      "id": "NFAG-MEGA-0260",
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    {
      "id": "NFAG-MEGA-0264",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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    {
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    {
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    {
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-0273",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
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      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0279",
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      "role": "exo-spacecraft assembly yard",
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0280",
      "family": "Asteroid processor",
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      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0281",
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      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0282",
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      "lengthKm": 5.4,
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    {
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-0340",
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0341",
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    {
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0399",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-0400",
      "family": "Asteroid processor",
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      "id": "NFAG-MEGA-0425",
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      "id": "NFAG-MEGA-0428",
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    {
      "id": "NFAG-MEGA-0450",
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    {
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
      "id": "NFAG-MEGA-0455",
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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    {
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    {
      "id": "NFAG-MEGA-0681",
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      "id": "NFAG-MEGA-0689",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-0692",
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    {
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      "id": "NFAG-MEGA-0721",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
      "id": "NFAG-MEGA-0751",
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    {
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    {
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    {
      "id": "NFAG-MEGA-0810",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "id": "NFAG-MEGA-0812",
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      "id": "NFAG-MEGA-0866",
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    {
      "id": "NFAG-MEGA-0867",
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      "id": "NFAG-MEGA-0868",
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    {
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    {
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    {
      "id": "NFAG-MEGA-0921",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
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    {
      "id": "NFAG-MEGA-0926",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
      "id": "NFAG-MEGA-0927",
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      "id": "NFAG-MEGA-0928",
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      "id": "NFAG-MEGA-0929",
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    {
      "id": "NFAG-MEGA-0932",
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    {
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    {
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    {
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    {
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "id": "NFAG-MEGA-0983",
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      "id": "NFAG-MEGA-0984",
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    {
      "id": "NFAG-MEGA-0985",
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    {
      "id": "NFAG-MEGA-0986",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-0988",
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    {
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      "id": "NFAG-MEGA-0993",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
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    {
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    {
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
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    {
      "id": "NFAG-MEGA-1040",
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    {
      "id": "NFAG-MEGA-1041",
      "family": "O'Neill cylinder",
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      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1042",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1043",
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1044",
      "family": "Stanford torus",
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      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1046",
      "family": "Mass driver",
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      "id": "NFAG-MEGA-1047",
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      "id": "NFAG-MEGA-1049",
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      "id": "NFAG-MEGA-1050",
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      "id": "NFAG-MEGA-1104",
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      "id": "NFAG-MEGA-1105",
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      "id": "NFAG-MEGA-1106",
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    {
      "id": "NFAG-MEGA-1108",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "primaryMaterial": "carbon lattice",
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      "primaryMaterial": "regolith composite",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
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      "primaryMaterial": "carbon lattice",
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    {
      "id": "NFAG-MEGA-1170",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1220",
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    {
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      "primaryMaterial": "regolith composite",
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      "id": "NFAG-MEGA-1223",
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      "id": "NFAG-MEGA-1224",
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      "id": "NFAG-MEGA-1225",
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      "id": "NFAG-MEGA-1226",
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      "id": "NFAG-MEGA-1227",
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    {
      "id": "NFAG-MEGA-1228",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "primaryMaterial": "carbon lattice",
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    {
      "id": "NFAG-MEGA-1282",
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      "id": "NFAG-MEGA-1284",
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    {
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    {
      "id": "NFAG-MEGA-1321",
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
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      "primaryMaterial": "carbon lattice",
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    {
      "id": "NFAG-MEGA-1324",
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    {
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    {
      "id": "NFAG-MEGA-1327",
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    {
      "id": "NFAG-MEGA-1329",
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    {
      "id": "NFAG-MEGA-1330",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
      "id": "NFAG-MEGA-1331",
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    {
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      "primaryMaterial": "aluminium-lithium frame",
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    {
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
      "id": "NFAG-MEGA-1335",
      "family": "Shipyard ring",
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1336",
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      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1337",
      "family": "O'Neill cylinder",
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      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1338",
      "family": "Dyson swarm collector",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1339",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1340",
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    {
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      "id": "NFAG-MEGA-1399",
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      "id": "NFAG-MEGA-1400",
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      "id": "NFAG-MEGA-1401",
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      "id": "NFAG-MEGA-1402",
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      "id": "NFAG-MEGA-1428",
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      "id": "NFAG-MEGA-1449",
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      "id": "NFAG-MEGA-1450",
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      "primaryMaterial": "regolith composite",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "id": "NFAG-MEGA-1455",
      "family": "Shipyard ring",
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    {
      "id": "NFAG-MEGA-1456",
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      "lengthKm": 51.2,
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    {
      "id": "NFAG-MEGA-1458",
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      "id": "NFAG-MEGA-1459",
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    {
      "id": "NFAG-MEGA-1460",
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      "id": "NFAG-MEGA-1463",
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      "id": "NFAG-MEGA-1464",
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      "id": "NFAG-MEGA-1465",
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      "id": "NFAG-MEGA-1466",
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    {
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    {
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    {
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    {
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    {
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    {
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "primaryMaterial": "carbon lattice",
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    {
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    {
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      "primaryMaterial": "regolith composite",
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    {
      "id": "NFAG-MEGA-1514",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1515",
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      "role": "compact free-space habitat",
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
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    {
      "id": "NFAG-MEGA-1516",
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      "role": "rotating torus habitat",
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      "id": "NFAG-MEGA-1634",
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    {
      "id": "NFAG-MEGA-1636",
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      "id": "NFAG-MEGA-1639",
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    {
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      "id": "NFAG-MEGA-1689",
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    {
      "id": "NFAG-MEGA-1690",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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    {
      "id": "NFAG-MEGA-1691",
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      "id": "NFAG-MEGA-1746",
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      "id": "NFAG-MEGA-1749",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "id": "NFAG-MEGA-1752",
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      "id": "NFAG-MEGA-1809",
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      "id": "NFAG-MEGA-1810",
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      "id": "NFAG-MEGA-1869",
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      "primaryMaterial": "nickel-iron asteroid feedstock",
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      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1928",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "materials study",
      "radiusKm": 2.07,
      "lengthKm": 5.98,
      "populationCapacity": 1609,
      "energyGW": 202.4,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1929",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "robotic precursor",
      "radiusKm": 19.2,
      "lengthKm": 76.8,
      "populationCapacity": 1008000,
      "energyGW": 213.6,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1930",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "industrial design",
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      "lengthKm": 4.5,
      "populationCapacity": 300,
      "energyGW": 225.0,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1931",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "concept",
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      "lengthKm": 3.12,
      "populationCapacity": 23400,
      "energyGW": 236.6,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1932",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "simulation",
      "radiusKm": 4.86,
      "lengthKm": 0.54,
      "populationCapacity": 37800,
      "energyGW": 248.4,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1933",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "materials study",
      "radiusKm": 6.72,
      "lengthKm": 0.11,
      "populationCapacity": 0,
      "energyGW": 260.4,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1934",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "robotic precursor",
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      "lengthKm": 52.2,
      "populationCapacity": 232,
      "energyGW": 272.6,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1935",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "industrial design",
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      "lengthKm": 2.1,
      "populationCapacity": 7800,
      "energyGW": 285.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1936",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "concept",
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      "lengthKm": 8.06,
      "populationCapacity": 2170,
      "energyGW": 297.6,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1937",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "simulation",
      "radiusKm": 25.6,
      "lengthKm": 102.4,
      "populationCapacity": 1344000,
      "energyGW": 310.4,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1938",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "materials study",
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      "lengthKm": 5.94,
      "populationCapacity": 396,
      "energyGW": 323.4,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1939",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "robotic precursor",
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      "lengthKm": 4.08,
      "populationCapacity": 30600,
      "energyGW": 336.6,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1940",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "industrial design",
      "radiusKm": 6.3,
      "lengthKm": 0.7,
      "populationCapacity": 49000,
      "energyGW": 10.5,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1941",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "concept",
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      "lengthKm": 0.14,
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      "energyGW": 14.4,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1942",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "simulation",
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      "lengthKm": 66.6,
      "populationCapacity": 296,
      "energyGW": 18.5,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1943",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "materials study",
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      "lengthKm": 2.66,
      "populationCapacity": 9880,
      "energyGW": 22.8,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1944",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "robotic precursor",
      "radiusKm": 0.9,
      "lengthKm": 2.6,
      "populationCapacity": 700,
      "energyGW": 7.0,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1945",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "industrial design",
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      "lengthKm": 35.2,
      "populationCapacity": 462000,
      "energyGW": 8.8,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1946",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "concept",
      "radiusKm": 0.72,
      "lengthKm": 2.16,
      "populationCapacity": 144,
      "energyGW": 10.8,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1947",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "simulation",
      "radiusKm": 1.56,
      "lengthKm": 1.56,
      "populationCapacity": 11700,
      "energyGW": 13.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1948",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "materials study",
      "radiusKm": 2.52,
      "lengthKm": 0.28,
      "populationCapacity": 19600,
      "energyGW": 15.4,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1949",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "robotic precursor",
      "radiusKm": 3.6,
      "lengthKm": 0.06,
      "populationCapacity": 0,
      "energyGW": 18.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1950",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "industrial design",
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      "lengthKm": 28.8,
      "populationCapacity": 128,
      "energyGW": 20.8,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1951",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "concept",
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      "lengthKm": 1.19,
      "populationCapacity": 4420,
      "energyGW": 23.8,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1952",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "simulation",
      "radiusKm": 1.62,
      "lengthKm": 4.68,
      "populationCapacity": 1260,
      "energyGW": 27.0,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1953",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "materials study",
      "radiusKm": 15.2,
      "lengthKm": 60.8,
      "populationCapacity": 798000,
      "energyGW": 30.4,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1954",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "robotic precursor",
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      "lengthKm": 3.6,
      "populationCapacity": 240,
      "energyGW": 34.0,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1955",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "industrial design",
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      "lengthKm": 2.52,
      "populationCapacity": 18900,
      "energyGW": 37.8,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1956",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "concept",
      "radiusKm": 3.96,
      "lengthKm": 0.44,
      "populationCapacity": 30800,
      "energyGW": 41.8,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1957",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "simulation",
      "radiusKm": 5.52,
      "lengthKm": 0.09,
      "populationCapacity": 0,
      "energyGW": 46.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1958",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "materials study",
      "radiusKm": 0.19,
      "lengthKm": 43.2,
      "populationCapacity": 192,
      "energyGW": 50.4,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1959",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "robotic precursor",
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      "lengthKm": 1.75,
      "populationCapacity": 6500,
      "energyGW": 55.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1960",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "industrial design",
      "radiusKm": 2.34,
      "lengthKm": 6.76,
      "populationCapacity": 1820,
      "energyGW": 59.8,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1961",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "concept",
      "radiusKm": 21.6,
      "lengthKm": 86.4,
      "populationCapacity": 1134000,
      "energyGW": 64.8,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1962",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "simulation",
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      "lengthKm": 5.04,
      "populationCapacity": 336,
      "energyGW": 70.0,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1963",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "materials study",
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      "lengthKm": 3.48,
      "populationCapacity": 26100,
      "energyGW": 75.4,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1964",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "robotic precursor",
      "radiusKm": 5.4,
      "lengthKm": 0.6,
      "populationCapacity": 42000,
      "energyGW": 81.0,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1965",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "industrial design",
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      "lengthKm": 0.12,
      "populationCapacity": 0,
      "energyGW": 86.8,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1966",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "concept",
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      "lengthKm": 57.6,
      "populationCapacity": 256,
      "energyGW": 92.8,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1967",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "simulation",
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      "lengthKm": 2.31,
      "populationCapacity": 8580,
      "energyGW": 99.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1968",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "materials study",
      "radiusKm": 3.06,
      "lengthKm": 8.84,
      "populationCapacity": 2380,
      "energyGW": 105.4,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1969",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "robotic precursor",
      "radiusKm": 28.0,
      "lengthKm": 112.0,
      "populationCapacity": 1470000,
      "energyGW": 112.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1970",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "industrial design",
      "radiusKm": 2.16,
      "lengthKm": 6.48,
      "populationCapacity": 432,
      "energyGW": 118.8,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1971",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "concept",
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      "lengthKm": 4.44,
      "populationCapacity": 33300,
      "energyGW": 125.8,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1972",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "simulation",
      "radiusKm": 6.84,
      "lengthKm": 0.76,
      "populationCapacity": 53200,
      "energyGW": 133.0,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1973",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "materials study",
      "radiusKm": 2.4,
      "lengthKm": 0.04,
      "populationCapacity": 0,
      "energyGW": 36.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1974",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "robotic precursor",
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      "lengthKm": 19.8,
      "populationCapacity": 88,
      "energyGW": 40.7,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1975",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "industrial design",
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      "lengthKm": 0.84,
      "populationCapacity": 3120,
      "energyGW": 45.6,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1976",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "concept",
      "radiusKm": 1.17,
      "lengthKm": 3.38,
      "populationCapacity": 910,
      "energyGW": 50.7,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1977",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "simulation",
      "radiusKm": 11.2,
      "lengthKm": 44.8,
      "populationCapacity": 588000,
      "energyGW": 56.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1978",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "materials study",
      "radiusKm": 0.9,
      "lengthKm": 2.7,
      "populationCapacity": 180,
      "energyGW": 61.5,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1979",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "robotic precursor",
      "radiusKm": 1.92,
      "lengthKm": 1.92,
      "populationCapacity": 14400,
      "energyGW": 67.2,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1980",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "industrial design",
      "radiusKm": 3.06,
      "lengthKm": 0.34,
      "populationCapacity": 23800,
      "energyGW": 73.1,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1981",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "concept",
      "radiusKm": 4.32,
      "lengthKm": 0.07,
      "populationCapacity": 0,
      "energyGW": 79.2,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1982",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "simulation",
      "radiusKm": 0.15,
      "lengthKm": 34.2,
      "populationCapacity": 152,
      "energyGW": 85.5,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1983",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "materials study",
      "radiusKm": 8.0,
      "lengthKm": 1.4,
      "populationCapacity": 5200,
      "energyGW": 92.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1984",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "robotic precursor",
      "radiusKm": 1.89,
      "lengthKm": 5.46,
      "populationCapacity": 1470,
      "energyGW": 98.7,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1985",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "industrial design",
      "radiusKm": 17.6,
      "lengthKm": 70.4,
      "populationCapacity": 924000,
      "energyGW": 105.6,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1986",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "concept",
      "radiusKm": 1.38,
      "lengthKm": 4.14,
      "populationCapacity": 276,
      "energyGW": 112.7,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1987",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "simulation",
      "radiusKm": 2.88,
      "lengthKm": 2.88,
      "populationCapacity": 21600,
      "energyGW": 120.0,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1988",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "materials study",
      "radiusKm": 4.5,
      "lengthKm": 0.5,
      "populationCapacity": 35000,
      "energyGW": 127.5,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1989",
      "family": "Orbital mirror",
      "role": "light and thermal control",
      "designPhase": "robotic precursor",
      "radiusKm": 6.24,
      "lengthKm": 0.1,
      "populationCapacity": 0,
      "energyGW": 135.2,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1990",
      "family": "Mass driver",
      "role": "lunar and asteroid launch infrastructure",
      "designPhase": "industrial design",
      "radiusKm": 0.22,
      "lengthKm": 48.6,
      "populationCapacity": 216,
      "energyGW": 143.1,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1991",
      "family": "Shipyard ring",
      "role": "exo-spacecraft assembly yard",
      "designPhase": "concept",
      "radiusKm": 11.2,
      "lengthKm": 1.96,
      "populationCapacity": 7279,
      "energyGW": 151.2,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1992",
      "family": "Asteroid processor",
      "role": "resource extraction and refinery",
      "designPhase": "simulation",
      "radiusKm": 2.61,
      "lengthKm": 7.54,
      "populationCapacity": 2030,
      "energyGW": 159.5,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1993",
      "family": "O'Neill cylinder",
      "role": "rotating habitat",
      "designPhase": "materials study",
      "radiusKm": 24.0,
      "lengthKm": 96.0,
      "populationCapacity": 1260000,
      "energyGW": 168.0,
      "primaryMaterial": "regolith composite",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1994",
      "family": "Dyson swarm collector",
      "role": "solar power node",
      "designPhase": "robotic precursor",
      "radiusKm": 1.86,
      "lengthKm": 5.58,
      "populationCapacity": 372,
      "energyGW": 176.7,
      "primaryMaterial": "nickel-iron asteroid feedstock",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1995",
      "family": "Bernal sphere",
      "role": "compact free-space habitat",
      "designPhase": "industrial design",
      "radiusKm": 3.84,
      "lengthKm": 3.84,
      "populationCapacity": 28800,
      "energyGW": 185.6,
      "primaryMaterial": "carbon lattice",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    },
    {
      "id": "NFAG-MEGA-1996",
      "family": "Stanford torus",
      "role": "rotating torus habitat",
      "designPhase": "concept",
      "radiusKm": 5.94,
      "lengthKm": 0.66,
      "populationCapacity": 46200,
      "energyGW": 194.7,
      "primaryMaterial": "aluminium-lithium frame",
      "researchStatus": "internal conceptual design catalog; not an observed alien megastructure"
    }
  ]
}