Great Dark Spot
Voyager 2 took this photo of Neptune's gigantic anti-cyclonic storm in 1989. Considered to be much like Jupiter's Red Spot, the storm was thought to span 8,000 by 4,100 miles. It was believed to have a vortex structure. When Hubble turned its lens on Neptune in 1994, the Great Dark Spot was found to have vanished. A new storm just like it was found roaming the northern hemisphere of the planet.