Bright patches on the surfaces of Callisto are thought to be freshly exposed ice.How did the ice get exposed?

Name: Bright patches on the surfaces of Callisto are thought to be freshly exposed ice.How did the ice get exposed?
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Meteoroid impacts are the most likely cause for the exposure of fresh ice patches on the surface of Callisto. Callisto is heavily cratered, demonstrating a history of impact events. Some of these impacts can be large enough to expose the subsurface ice.

Bright Patches on the Surfaces of Callisto Are Thought to Be