Neptune spins on its axis in about 16 hours and revolves around the sun in 165 Earth years. Neptunes gravity is slightly stronger then Earth's. Voyager 2 found that Neptune had four giant faint rings and eight moons. Of Neptunes moons Triton is the most important having a diameter of 1,680 miles. Due to its distance from the sun Neptune receives only one one thousandth as much sunlight as Earth.
Neptunes daytime seems dark.
There is turbulent weather, with winds as fast as 700mph over many areas. A hurricane about the size of Earth creates an area on the surface called the Great Dark Spot. Winds on the edges of this spot have been measured at over 1,400mph. The outer layer of Neptune is all gas mostly hydrogen, helium and methane. Deep inside the planet is an icy slush of water, ammonia, and methane surrounding a rocky core.