Neptune is the eighth and farthest known planet orbiting the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth. Compared to Uranus, its neighbouring ice giant, Neptune is slightly smaller, but more massive and dense. Being composed primarily of gases and liquids,[23] it has no well-defined solid surface.
Fun Facts
Diameter: 49528 km
Gravity: 11 m/s
2
Escape Velocity: 23.5 km/s
Length of day: 16.1 hours
Length of orbit: 59800 days (earth days)
Average distance from Sun: 4495.1 million km
In the News
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Neptune has 16 moons
Far Above the World
