
Callisto Mosaic
Callisto was revealed by the Voyager cameras to be a heavily cratered and hence geologically inactive world. This mosaic of Voyager 1 images, obtained on March 6 from a distance of about 400,000 kilometers, shows surface detail as small as 10 kilometers across. The prominent old impact feature Valhalla has a central bright spot about 600 kilometers across, probably representing the original impact basin. The concentric bright rings extend outward about 1500 kilometers from the impact center.
Image Credit: NASA/JPL-Caltech
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https://science.nasa.gov/image-detail/pia00080-2/
Image CreditNASA/JPL-Caltech
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