Saturn's Hyperion: A Moon with Odd Craters
Nobody is sure what lies at the bottom of Hyperion's strange craters. The robot Cassini spacecraft (which is now orbiting Saturn) swooped past the the sponge-textured moon in 2005 and 2010 and took images with unprecedented detail. The picture above is an image from 2005 shown in false color and depicts a remarkable world strewn with strange craters and a generally odd surface. The slight differences in color most likely show differences in surface composition. Hyperion is about 250 kilometers across, roatates chaotically, and has a density so low it might house a vast system of caverns inside.
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