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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.   
      
                                   2024 March 22   
      
                              Phobos: Moon over Mars   
       Image Credit: NASA, ESA, Zolt Levay (STScI) - Acknowledgment: J.Bell   
                              (ASU) and M.Wolff (SSI)   
      
      Explanation: A tiny moon with a scary name, Phobos emerges from behind   
      the Red Planet in this timelapse sequence from the Earth-orbiting   
      Hubble Space Telescope. Over 22 minutes the 13 separate exposures were   
      captured near the 2016 closest approach of Mars to planet Earth.   
      Martians have to look to the west to watch Phobos rise, though. The   
      small moon is closer to its parent planet than any other moon in the   
      Solar System, about 3,700 miles (6,000 kilometers) above the Martian   
      surface. It completes one orbit in just 7 hours and 39 minutes. That's   
      faster than a Mars rotation, which corresponds to about 24 hours and 40   
      minutes. So on Mars, Phobos can be seen to rise above the western   
      horizon 3 times a day. Still, Phobos is doomed.   
      
                      Tomorrow's picture: Ares 3 Landing Site   
        __________________________________________________________________   
      
          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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