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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.   
      
                                    2022 July 3   
      
                            Phobos: Doomed Moon of Mars   
                 Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA   
      
      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, with objects as small as 10 meters   
      visible. 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: strawberry supermoon   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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