What is this planet?

Neptune is the farthest known planet from the sun in the solar system. Its also known for being the 4th largest planet in diameter, the densest giant planet, and is 17 times the mass of Earth. Neptune orbits the sun once every 164.8 years and takes 18 hours for it to complete a rotation. Its mass of 1.0243 x 1026  kg is intermediate between earth and other gas planets. Neptune is, on average, 2.8 billion miles from the sun 


The mantle is equivalent to 10 to 15 earth masses and is rich in water, ammonia, and methane. The mantle may consist of a layer of ionic water in which the water molecules break down into a soup of hydrogen and oxygen ions. The core of neptune is composed of iron, nickel, and silicates with an interior model giving a mass about 1.2 times that of earth. The average temperature on neptune is -373 degrees fahrenheit  


Neptune's atmosphere is made from about 80% hydrogen and 19% helium it also contains a small amount of water and methane which gives the green bluish color.Like uranus, neptune is an ice giant and it's internal structure resembles that of uranus.

Neptune's moons 

Neptune has 13 known moons. Triton is the largest moon, neptune's second known satellite is the irregular moon nereid.

In 1989 voyager 2 found six moons such as proteus, naiad,Thalassa, Despine,Galatea, larissa and 5 new irregular moons were discovered and announced. Since neptune was the roman god of the sea Neptune's moons have been named after lesser sea gods. 

Fun facts

Neptune also has a planetary ring system, though one much less substantial than that of saturn. In 1989, the great dark spot, a storm on neptune was spotted by voyager 2 and resembled the great red spot of jupiter. The strongest winds in our solar system have come from neptune, with speeds of 2,000 kilometers per hour.

Neptune's storms

Neptune's dark spots are thought to occur in the troposphere. As they are stable features that can persist for several months, they are thought to be vortex structures.


Pictures also from wikipedia.

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Public - 9/27/16, 3:13 PM