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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 September 11   
      
                   Planets of the Solar System: Tilts and Spins   
              Video Credit: NASA, Animation: James O'Donoghue (JAXA)   
      
      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, most certainly underwent dramatic   
      spin-altering collisions during the early days of the Solar System. The   
      reasons 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: stars and sprites   
        __________________________________________________________________   
      
          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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