Valhalla (crater)
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Valhalla is the largest impact crater on Jupiter's moon Callisto. It has a bright central region 600 km across, and striking concentric rings extending to a diameter of approximately 3,000 km around that. The ring fracture system may have formed as semi-liquid material slumped towards the centre of the crater following the impact. The crater is named after Valhalla, Odin's hall in Norse mythology.
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