This image of Jupiter's icy satellite Europa shows surface features such as domes and ridges, as well as a region of disrupted terrain including crustal plates which are thought to have broken apart and 'rafted' into new positions.
The anaglyph shows Pwyll crater on Jupiter's icy satellite Europa, captured by NASA's Galileo Orbiter. 3D glasses are necessary to identify surface detail.
The concentric rings surrounding Valhalla are perhaps the most distinctive geological feature on Callisto. This NASA Voyager 1 close-up shows a segment of the ridged terrain.
Europa Global Views in Natural and Enhanced Colors
This color composite view combines violet, green, and infrared images of Jupiter's intriguing moon, Europa, for a view of the moon in natural color (left) and in enhanced color designed to bring out subtle color differences in the surface (right).
Jupiter, its Great Red Spot and three of its four largest satellites are visible in this photo taken Feb. 5, 1979, by Voyager 1. Io, Europa, and Callisto are seen against Jupiter's disk.
Three full-disk color views of Jupiter's volcanic moon Io as seen by NASA's Galileo spacecraft are shown in enhanced color to highlight details of the surface.
This image, taken by NASA's Galileo spacecraft, shows a blue-colored volcanic plume consistent with the presence of sulfur dioxide gas and 'snow' condensing from the gas as the plume expands and cools.
This true color mosaic of Jupiter was constructed from images taken by the narrow angle camera onboard NASA's Cassini spacecraft, during its closest approach to the giant planet and is its most detailed portrait.
This photo, taken on Jan. 9, 1979 by NASA's Voyager 1, is dominated by the Great Red Spot. Swirling, storm-like features possibly associated with wind shear can be seen both to the left and above the Red Spot.
NASA's Voyager 1 took this photo of Jupiter and two of its satellites (Io, left, and Europa) on Feb. 13, 1979. Io is above Jupiter's Great Red Spot; Europa is above Jupiter's clouds. The poles are dark and reddish.
This color image of the Jovian moon Europa was acquired by NASA's Voyager 2 during its close encounter on Jul. 9, 1979. Europa, the size of our moon, is thought to have a crust of ice perhaps 100 kilometers thick which overlies the silicate crust.
Bright scars on a darker surface testify to a long history of impacts on Jupiter's moon Callisto in this image of Callisto from NASA's Galileo spacecraft.
This view of the Great Red Spot is seen in greatly exaggerated color. The colors do not represent the true hues seen in the Jovian atmosphere but have been produced by special computer processing to enhance subtle variations in both color and shading.