Callisto:
The heavily-cratered
surface |
9.18
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Galileo
view of a large part Callisto showing its dark, heavily-cratered surface.
The younger impact craters are the most prominent, because their ejecta
blankets have not yet become radiation-darkened. |
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Image
Credit:
NASA |
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Galileo
view of a large part Callisto showing its dark, heavily-cratered surface.
The younger impact craters are the most prominent, because their ejecta
blankets have not yet become radiation-darkened. Towards the left is a multiringed
impact basin named Valhalla. The 600 km diameter pale zone in Valhalla's
centre marks the site of the original crater, but this was too large a structure
for the lithosphere to support and its has long since collapsed. This is
surrounded by rings of concentric fractures, the outermost having a diameter
of 4000 km. |
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Text
credit: David A. Rothery |
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