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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.   
      
                                  2026 January 25   
        A large irregularly shaped object is shown that is mostly brown and   
         shows many craters. Please see the explanation for more detailed   
                                   information.   
      
                            Phobos: Doomed Moon of Mars   
                 Image Credit: NASA, LPL (U. Arizona), MRO, HiRISE   
      
      Explanation: This moon is doomed. Mars, the red planet named for the   
      Roman god of war, has two tiny moons, Phobos and Deimos, whose names   
      are derived from the Greek for Fear and Panic. These Martian moons may   
      well be captured asteroids originating in the main asteroid belt   
      between Mars and Jupiter or perhaps from even more distant reaches of   
      our Solar System. The larger moon, Phobos, is indeed seen to be a   
      cratered, asteroid-like object in this stunning color image from the   
      robotic Mars Reconnaissance Orbiter, which can image objects as small   
      as 10 meters. But Phobos orbits so close to Mars - about 5,800   
      kilometers above the surface compared to 400,000 kilometers for our   
      Moon - that gravitational tidal forces are dragging it down. In perhaps   
      50 million years, Phobos is expected to disintegrate into a ring of   
      debris.   
      
                        Tomorrow's picture: bubbling galaxy   
        __________________________________________________________________   
      
          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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