Neptune
Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.
Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of its atmosphere. Neptune is named after the Roman god of the sea. Neptune is not visible to the unaided eye and is the only planet in the Solar System found by mathematical prediction rather than emperical observation.
Neptune Facts
- Equatorial Diameter: 24,764 km
- Polar Diameter: 108,728 km
- Mass: 1.0234 x 10^26 kg(17 earths)
- Moons: 14(Proteus, Larissa, Galatea, and Despina)
- Orbit Distance: 4.5 billion km
- Orbit Period: 164.79 years
- Surface Temperature: -221.3° to -201.15°C
- First Record: 23rd Sepetember 1846
- Rings: 3 main rings(several feint rings)