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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.   
      
                                 2025 September 14   
      
                   Planets of the Solar System: Tilts and Spins   
           Video Credit: NASA, Animation: James O'Donoghue (U. Reading)   
      
      Explanation: How does your favorite planet spin? Does it spin rapidly   
      around a nearly vertical axis, or horizontally, or backwards? The   
      featured video animates NASA images of all eight planets in our Solar   
      System to show them spinning side-by-side for an easy comparison. In   
      the time-lapse video, a day on Earth -- one Earth rotation -- takes   
      just a few seconds. Jupiter rotates the fastest, while Venus spins not   
      only the slowest (can you see it?), but backwards. The inner rocky   
      planets across the top underwent dramatic spin-altering collisions   
      during the early days of the Solar System. Why planets spin and tilt as   
      they do remains a topic of research with much insight gained from   
      modern computer modeling and the recent discovery and analysis of   
      hundreds of exoplanets: planets orbiting other stars.   
      
                           Tomorrow's picture: sun belch   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
                     NASA Web Privacy, Accessibility, Notices;   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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