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Neptune's Great Dark Spot.


2,796,460,000 miles from the sun.

Its year is 165 Earth years long.

Its day is 16  hours 11 minutes.

Its diameter is 30,775 miles across.

Its atmosphere is mainly Hydrogen

with a little Helium and traces of methane and ammonia

Its temperature is -360o degrees Fahrenheit   (Special, see below)

Neptune is the forth of the gas giants which include- Jupiter, Saturn, Uranus, and Neptune.  Neptune is 64% percent denser than water, making it the densest of the four.  Neptune has Eight moons, of which, Triton is the largest 1680 miles in diameter.  Triton, unlike most planet's moons, is thought to have been from somewhere else and caught in Neptune's gravity.  Moons around most planets consist of the same materials that their parent planet has.  Triton does not.  Neptune also has a dark spot, like Jupiter's Red spot.  In fact, Neptune's Great Dark Spot is in the same latitude as Jupiter's.  Neptune is 17 times larger than Earth.

Amazingly, Neptune's lower atmosphere's temperature is a frigid -360 degrees Fahrenheit, But...  Neptune's upper atmosphere can have surges of heat (up to 900 degrees Fahrenheit).  Whether this is due to a chemical reaction, a methane ignition, or electrical charge- it still remains to be found.  Neptune has violent winds, too (nearly 1500 miles per hour).

Neptune is now considered the farthest planet in our solar system.   (See poor Pluto). 


Triton, Neptune's largest moon, 2700 km diameter.

"Scooter"   Neptune's tornado storm- bottom left.

Neptune also has rings, but very few.