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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 September 7   
      
                                 Small Moon Deimos   
                 Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA   
      
      Explanation: Mars has two tiny moons, Phobos and Deimos, named for the   
      figures in Greek mythology Fear and Panic. Detailed surface views of   
      smaller moon Deimos are shown in both these panels. The images were   
      taken in 2009, by the HiRISE camera on board the Mars Reconnaissance   
      Orbiter spacecraft, NASA's long-lived interplanetary internet   
      satellite. The outermost of the two Martian moons, Deimos is one of the   
      smallest known moons in the Solar System, measuring only about 15   
      kilometers across. Both Martian moons were discovered in 1877 by Asaph   
      Hall, an American astronomer working at the US Naval Observatory in   
      Washington D.C. But their existence was postulated around 1610 by   
      Johannes Kepler, the astronomer who derived the laws of planetary   
      motion. In this case, Kepler's prediction was not based on scientific   
      principles, but his writings and ideas were so influential that the two   
      Martian moons are discussed in works of fiction such as Jonathan   
      Swift's Gulliver's Travels, written in 1726, over 150 years before   
      their discovery.   
      
                    Tomorrow's picture: large galaxy Andromeda   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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