'Great Rift Wall' pictures a large geological fault on a moon of the large gaseous planet, Jupiter. The height from the top-edge of the wall to the valley floor is over 30,000 feet (10,000 meters) and is higher than Mt. Everest on Earth. The section of the wall visible in this picture extends almost 40 miles ( 65 kilometers ) into the distance - but with no atmosphere to obscure the ridge-lines, surfaces, and horizon - the view remains sharp and well-defined despite the relatively large distances involved.

A faint suggestion of layered material in the shadowed areas of the fault-wall can be made out - perhaps indicating this moon had an atmosphere in the distant past. The valley floor below us (our viewpoint is from half-way up the wall) may also indicate an atmosphere had been present at some time, causing erosion of rim-material that settled into the valley as sand or dust.

The rim-rock edges also appear rounded - or eroded - although the distances are great enough to make this only a suggestion rather than a conclusion until a much closer inspection can be made.