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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                   2023 March 12   
      An oblong moon is shown that appears sponge like and features many odd   
       craters. Close inspection shows that the bottoms of these craters are   
         covered with a dark material. Please see the explanation for more   
                               detailed information.   
      
                    Saturn's Hyperion: A Moon with Odd Craters   
              Image Credit: NASA, ESA, JPL, SSI, Cassini Imaging Team   
      
      Explanation: What lies at the bottom of Hyperion's strange craters? To   
      help find out, the robot Cassini spacecraft that once orbited Saturn   
      swooped past the sponge-textured moon and took images of unprecedented   
      detail. A six-image mosaic from the 2005 pass, featured here in   
      scientifically assigned colors, shows a remarkable world strewn with   
      strange craters and an odd, sponge-like surface. At the bottom of most   
      craters lies some type of unknown dark reddish material. This material   
      appears similar to that covering part of another of Saturn's moons,   
      Iapetus, and might sink into the ice moon as it better absorbs warming   
      sunlight. Hyperion is about 250 kilometers across, rotates chaotically,   
      and has a density so low that it likely houses a vast system of caverns   
      inside.   
      
                          Tomorrow's picture: tree colors   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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