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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.   
      
                                   2025 April 13   
       A brown background is shown covered with a gray topping that has many   
           holes. On the upper right, there is a deep hole in the brown   
           background. In this hole is more gray topping. Please see the   
                    explanation for more detailed information.   
      
                              An Unusual Hole in Mars   
                 Image Credit: NASA, MRO, HiRISE, JPL, U. Arizona   
      
      Explanation: What created this unusual hole in Mars? Actually, there   
      are numerous holes pictured in this Swiss cheese-like landscape, with   
      all-but-one of them showing a dusty, dark, Martian terrain beneath   
      evaporating, light, carbon dioxide ice. The most unusual hole is on the   
      upper right, spans about 100 meters, and seems to punch through to a   
      lower level. Why this hole exists and why it is surrounded by a   
      circular crater remains a topic of speculation, although a leading   
      hypothesis is that it was created by a meteor impact. Holes such as   
      this are of particular interest because they might be portals to lower   
      levels that extend into expansive underground caves. If so, these   
      naturally occurring tunnels are relatively protected from the harsh   
      surface of Mars, making them relatively good candidates to contain   
      Martian life. These pits are therefore also prime targets for possible   
      future spacecraft, robots, and even human interplanetary explorers.   
      
                         Tomorrow's picture: radio center   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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