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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 July 8   
      
                                  Stickney Crater   
                 Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA   
      
      Explanation: Stickney Crater, the largest crater on the martian moon   
      Phobos, is named for Chloe Angeline Stickney Hall, mathematician and   
      wife of astronomer Asaph Hall. Asaph Hall discovered both the Red   
      Planet's moons in 1877. Over 9 kilometers across, Stickney is nearly   
      half the diameter of Phobos itself, so large that the impact that   
      blasted out the crater likely came close to shattering the tiny moon.   
      This enhanced-color image of Stickney and surroundings was recorded by   
      the HiRISE camera onboard the Mars Reconnaissance Orbiter as it passed   
      within some six thousand kilometers of Phobos in March of 2008. Even   
      though the surface gravity of asteroid-like Phobos is less than   
      1/1000th Earth's gravity, streaks suggest loose material slid down   
      inside the crater walls over time. Light bluish regions near the   
      crater's rim could indicate a relatively freshly exposed surface. The   
      origin of the curious grooves along the surface is mysterious but may   
      be related to tidal stresses experienced by close-orbiting Phobos or   
      the crater-forming impact itself.   
      
                          Tomorrow's picture: doomed star   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
      
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