description Valhalla (Callisto) Overview
On Jupiter's moon Callisto, Valhalla forms a vast impact structure distinguished by rings around a brighter central region. The concentric features extend across thousands of kilometers, making the full ring system much broader than the central impact area alone. Its appearance records how Callisto's icy outer layers responded to a major ancient collision. Valhalla is among the large impact structures of the solar system and is particularly relevant to the study of icy moons.
Scientists examine its rings and surrounding surface to understand deformation after impact and the properties of the material beneath the crust. For readers comparing planetary craters, it shows why a basin on an ice-rich body can look different from one on a rocky world. Its value lies in the record of Callisto's surface evolution and the behavior of ice under extreme impact conditions.
help Valhalla (Callisto) FAQ
Which planet's moon features the Valhalla impact basin?
The Valhalla impact basin is located on Callisto, which is the second-largest moon of Jupiter. Callisto is heavily cratered, but Valhalla stands out as its most prominent geological feature.
What is the physical structure of the Valhalla basin?
Valhalla is an immense multi-ring impact basin. It features a central bright plain surrounded by up to 15 concentric rings extending outward, created by the shockwave of the ancient impact fracturing the moon's icy crust.
How large is the Valhalla crater?
The central bright spot of Valhalla is roughly 360 kilometers wide, but the outer ring system stretches over 1,900 kilometers across. This makes it one of the largest impact features in the entire solar system.
Which NASA spacecraft first imaged Valhalla?
The Valhalla basin was first closely observed by the twin Voyager spacecraft in 1979. Later, the Galileo orbiter provided much higher-resolution images of Callisto's surface in the 1990s, revealing the intricate details of Valhalla's rings.
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