Valhalla (crater)

Valhalla (/vælˈhælə/ val-HAL-ə) is a vast multi-ring basin on Callisto, the outermost of the Galilean moons. It is the largest multi-ring impact basin in the Solar System. It is named after Valhalla, the hall where warriors are taken after death in Norse mythology.

Valhalla consists of a bright central region 360 km across, an inner ridge and trough zone, and striking concentric rings extending up to about 1,900 km from the center. Several large impact craters and crater chains are superimposed on Valhalla. The multi-ring system may have formed as semi-liquid or liquid material underlying the brittle lithosphere punctured by the impactor slumped towards the center of the crater following the impact.

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