Neptune

Planet Properties (Orbit and Rotation based on Earth's days/hours/minutes)

Distance to Sun: 2,795,084,800 miles

Equatorial radius: 15,388 miles

Equatorial circumference: 96,683 miles

Length of year(Orbit): 164.79 Earth years

Length of day(rotation): 0d 16h 6m

Axial tilt: 29.58 degrees

Number of moons: 13

Neptune is similar in structure to Uranus. It has a core of rock and possibly ice, surrounded by a mix of water, methane, and ammonia ices, and topped off with a hydrogen-rich atmosphere. The planet undergoes seasonal change, and its atmosphere is unexpectedly dynamic. It experiences ferocious equatorial winds, fast-moving bright clouds, and short-lived gigantic storms. The planet is surrounded by a sparse system of five complete rings and one partial ring. Only one of its 13 moons, Triton, is of notable size, and four are within the planet's ring system.

Rings of Neptune
Neptune has five rings: Galle, Le Verrier, Lassell, Arago, and Adams. Its rings were named after the astronomers who made an important discovery regarding the planet. The rings are composed of at least 20% dust with some of the rings containing as much as 70% dust; the rest of the material comprising the rings is small rocks. The planet’s rings are difficult to see because they are dark and vary in density and size. Astronomers think Neptune’s rings are young compared to the age of the planet, and that they were probably formed when one of Neptune’s moons was destroyed.

Atmosphere
Neptune's atmosphere is made up of hydrogen, helium, and methane. Like Earth's atmosphere, Neptune's has clouds and storm systems that revolve around the planet, but with wind speeds of 300 m/sec (700 mi/hr), and clouds of frozen methane.

Great Dark Spot
The "Great Dark Spot" discovered by Voyager 2 is a storm system that resembles Jupiter's Red Spot, and is surrounded by white cirrus clouds of frozen methane.

Moons of Neptune:

The Planets

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