Crater on Uranus's moon Umbriel
Wunda is a large crater on the surface of Uranus' moon Umbriel. It is 131 km in diameter and is located near the equator of Umbriel. The crater is named after "Wunda", a dark spirit of Australian aboriginal mythology.
Wunda has a prominent albedo feature on its floor, which takes the shape of a ring of bright material at least 10 km in radial width. The reason for its brightness, which stands out from the very dark composition of the moon as a whole, is unknown. It may be either a fresh impact deposit or a deposit of carbon dioxide ice, which formed when the radiolytically formed carbon dioxide migrated from all over the surface of Umbriel and got trapped inside relatively cold Wunda.
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