Surface feature · Callisto
Valhalla
A giant multi-ring impact structure on Callisto — concentric rings of ridges rippling out from a bright central plain across the most heavily-cratered surface in the Solar System.
Knowledge connections
- Member of groupImpact Basin
- Located onCallisto
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.