Driffer

The biggest, the heaviest...

Heated up by tidal forces of the parent planet and two other most massive moons in the system, Driffer has most likely a liquid iron core. Still, the distance from the star and lack of atmosphere makes it a frigid place. Cracks and chaps are clearly visible all across the moon's surface - this suggests that at some point in the past water could have been present there - apparently it has evaporated or at least greatly reduced in volume by now.

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