1. Diameter: Approximately 49,244 km (30,598 miles)
2. Mass: About 1.02 × 10^26 kg (17 Earths)
3. Surface Gravity: 11.15 m/s² (1.14 g)
4. Orbital Period: 164.8 Earth years
5. Rotational Period: Approximately 16.11 hours
6. Atmosphere: Composed primarily of hydrogen (80%), helium (19%), and methane (1.5%)
7. Average Surface Temperature: -214 degrees Celsius (-353 degrees Fahrenheit)
8. Surface Pressure: No solid surface; pressure increases with depth into the planet
9. Moons: 14 known moons, including Triton, Proteus, Nereid, and Larissa
10. Tilt of Axis: 28.32 degrees (causing seasonal changes)
11. Orbital Speed: 5.43 km/s (19,560 km/h or 12,158 mph)
12. Surface Features: No solid surface; visible cloud tops, bands, and large storm systems such as the Great Dark Spot
13. Magnetic Field: Tilted 47 degrees from the rotational axis, offset from the planet's center
14. Solar Day (Neptunian Day): Approximately 16.11 Earth hours
15. Atmospheric Density: Dense atmosphere extending deep into the planet
16. Surface Composition: No solid surface; composed of gas and ice, primarily water, ammonia, and methane ices
17. Geological Activity: No geological activity on Neptune itself, but evidence of geological activity on its moon Triton
18. Ring System: Faint ring system composed of dust particles and small rocks, discovered in 1984
19. Distance from Sun: Average of about 4.50 billion km (2.79 billion miles)
20. Albedo (Reflectivity): Average albedo of 0.41
21. Escape Velocity: 23.5 km/s (52,500 mph)
22. Weather: Extreme and dynamic weather patterns, with high-speed winds and large storm systems
23. Radiation: Moderate levels of radiation in its magnetosphere
24. Interior Composition: Likely has a rocky core surrounded by a mantle of water, ammonia, and methane ices, with an outer layer of hydrogen and helium
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