This storm is often called The Great Dark Spot.  We do not know how long this storm has been active, because it is so far away that we could not get a good view of Neptune until modern times when we began to send robot explorers.
For many centuries people did not know that this planet even existed.  It was discovered by Johann Galle and Heinrich D'Arrest in 1846.
Neptune has six rings which circle the planet. Neptune has 13 moons that we know of.  Because Neptune is so far away, it is difficult to see any of these worlds.  There are probably many more moons orbiting this blue planet which we have not yet discovered.  Scientists think there is a very large water ocean under Neptune's clouds. Neptune is the eighth and farthest planet from the Sun in our Solar System. It is the fourth-largest planet by diameter and the third-largest by mass. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus.
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