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3. Ganymede

Ganymede, while larger than our Moon, has a similar appearance - bright and dark areas. The dark areas are older, heavier cratered while the bright areas are newer with fewer craters. However, the surface of Ganymede is comprised of icy rock.

Ganymede is 5,262 km in diameter - the largest moon in our Solar System - and is 1,070,000 km away from Jupiter.

As seen earlier, the physiology of Ganymede is very similar to Europa with the exception of the crust. A liquid ocean may lie underneath as evidence of geologic activity on the surface:

these stress fractures are the result of possibly water trying to push upward while Jupiter and the other three main moons apply their gravity.

The image above also demonstrates the same patterns - notice the impact craters.

Other interesting features of Ganymede are a result of outside forces: an impact of what might be a broken object similar to the impact of comet Shoemaker-Levy on Jupiter.

Other surprises include a very strong magnetic field discovered by the Galileo probes, with what might be its own magnetosphere. The core also contains metallic rock similar to Europa, and a liquid ocean could enhance the magnetic field.

Another surprise, Ganymede does have a very tenuous atmosphere comprised of oxygen and ozone.

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