{"object_id":"planet-saturn","surface_pressure_bar":1000.0,"pressure_note":">>1000 bars","temperature_k":134.0,"temperature_note":"134 K (-139 C)","density_kg_m3":0.19,"scale_height_km":59.5,"mean_molecular_weight":2.07,"wind_note":"Up to 400 m/s (<30 degrees latitude) Up to 150 m/s (>30 degrees latitude)","source":"NASA Planetary Fact Sheet","composition":[{"species":"Molecular hydrogen (H2)","fraction":96.3,"unit":"%","uncertainty":"2.4%"},{"species":"Helium (He)","fraction":3.25,"unit":"%","uncertainty":"2.4%"},{"species":"Methane (CH4)","fraction":4500.0,"unit":"ppm","uncertainty":"2000"},{"species":"Ammonia (NH3)","fraction":125.0,"unit":"ppm","uncertainty":"75"},{"species":"Hydrogen Deuteride (HD)","fraction":110.0,"unit":"ppm","uncertainty":"58"},{"species":"Ethane (C2H6)","fraction":7.0,"unit":"ppm","uncertainty":"1.5"}]}