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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 February 26   
      
                        Martian Moon Eclipses Martian Moon   
      Video Credit: ESA, DLR, FU Berlin, Mars Express; Processing & CC BY 2.0   
                               License: Andrea Luck   
      
      Explanation: What if there were two moons in the sky -- and they   
      eclipsed each other? This happens on Mars. The featured video shows a   
      version of this unusual eclipse from space. Pictured are the two moons   
      of Mars: the larger Phobos, which orbits closer to the red planet, and   
      the smaller Deimos, which orbits further out. The sequence was captured   
      last year by the ESACÇÖs Mars Express, a robotic spacecraft that itself   
      orbits Mars. A similar eclipse is visible from the Martian surface,   
      although very rarely. From the surface, though, the closer moon Phobos   
      would appear to pass in front of farther moon Deimos. Most oddly, both   
      moons orbit Mars so close that they appear to move backwards when   
      compared to Earth's Moon from Earth, both rising in west and setting in   
      the east. Phobos, the closer moon, orbits so close and so fast that it   
      passes nearly overhead about three times a day.   
      
                        Tomorrow's picture: spaghetti star   
        __________________________________________________________________   
      
          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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