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. via
Florence Harrison. Headpiece to “The Defense of Guinevere” from: Early Poems of William Morris. London: Blackie & Son, 1914.