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| Saturn's moon Hyperion. Image Cassini APOD |
Wildly rotating and only 250 kilometers in diameter Hyperion may be full of cavities, a true space sponge!
An image from the 2005 pass, shown above in false color, shows a remarkable world strewn with strange craters and a generally odd surface... and has a density so low that it might house a vast system of caverns inside.
from text in APOD
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