Every day NASA posts a new astronomy-related picture to their site. I am going to bring them to you in case you forget.
Today’s image is titled Saturn’s Hyperion: A Moon With Odd Craters.
Explanation: What lies at the bottom of Hyperion‘s strange craters? Nobody’s sure. To help find out, the robot Cassini spacecraft now orbiting Saturnswooped past the sponge-textured moon in 2005 and2010 and took images of unprecedented detail. An image from the 2005 pass, shown above in false color, shows a remarkable world strewn with strange craters and a generally odd surface. The slight differences in color likely show differences in surface composition. At the bottom of most craters lies some type of unknown dark material. Inspection of the image shows bright features indicating that the dark material might be only tens of meters thick in some places. Hyperion is about 250 kilometers across, rotates chaotically, and has a density so low that it might house a vast system of caverns inside.