{
    "id": "TEST_VOLCANIC", "name": "Caldera", "body_type": "planet",
    "planet_class": "volcanic", "body_scale": "planet", "seed": 99967,
    "star": {"type": "M", "luminosity_solar": 0.04, "color_temp_K": 3200},
    "orbit": {"distance_au": 0.12, "period_days": 18, "axial_tilt_deg": 3.0},
    "physical": {"gravity_g": 1.1, "oblateness": 0.004, "atmosphere": "toxic", "atmosphere_color": [0.7, 0.4, 0.2]},
    "terrain": {"land_fraction": 0.85, "polar_ice_lat": 0.99, "tectonics": "extreme", "max_elevation_km": 18.0},
    "environment": {"geothermal_flux": "extreme", "uv_index": "low", "substrate": "silicate", "chemosynthetic": false, "hydrosphere": "none"},
    "clouds": {"enabled": true, "coverage_base": 0.35},
    "render": {"globe_light_angle_deg": 120, "specular_ocean": false, "night_side_ambient": 0.040}
}