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Ganymede is a moon that wears its scars with the resignation of an old veteran. Its furrowed crust speaks of harder times, its tilt like a limp from an injury it'd prefer to never speak of again.
Given the lines' antiquity beneath newer layers of rock, and their concentric nature, they were quickly assumed to be the result of a collision when the Solar System was still learning to regulate its emotions.
Such is the chaos of planet formation, there is hardly an object in the entire Solar System that hasn't been set spinning, wobbling, or tilting askew by titanic feats of physics.Like Pluto with its moon Charon, Ganymede is tidally locked with its host, forced by gravity to forever present one face to the cloud tops below by virtue of the intense gravitational pull between its and Jupiter's masses putting the brakes on its rotation.
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