... Jupiterт??s red spot is likely a sunburn, not a blush . ... The ruddy color of Jupiter s Great Red Spot is likely a product of simple chemicals being broken apart by sunlight in the planet s upper atmosphere, according to a new analysis of data from NASA s Cassini mission. ... They found that the light-scattering properties of their red concoction nicely matched a model of the Great Red Spot in which the red-colored material is confined to the uppermost reaches of the giant cyclone-like feature. ...