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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.   
      
                                  2023 October 23   
       Jupiter's moon Io is shown as photogaphred recently by NASA's passing   
       Juno spacecraft. The moon is nearly half- lit by the distant Sun and   
       shows a complex surface including the colors yellow, orange, and dark   
      brown. Near the top, the plume of an active volcano can be seen. Please   
                see the explanation for more detailed information.   
      
                           Moon Io from Spacecraft Juno   
       Image Credit: NASA, JPL-Caltech, SwRI, MSSS; Processing & Copyright:   
                        Ted Stryk & Fernando Garc+¡a Navarro   
      
      Explanation: There goes another one! Volcanoes on Jupiter's moon Io   
      keep erupting. To investigate, NASA's robotic Juno spacecraft has begun   
      a series of visits to this very strange moon. Io is about the size of   
      Earth's moon, but because of gravitational flexing by Jupiter and other   
      moons, Io's interior gets heated and its surface has become covered   
      with volcanoes. The featured image is from last week's flyby, passing   
      within 12,000 kilometers above the dangerously active world. The   
      surface of Io is covered with sulfur and frozen sulfur dioxide, making   
      it appear yellow, orange and brown. As hoped, Juno flew by just as a   
      volcano was erupting -- with its faint plume visible near the top of   
      the featured image. Studying Io's volcanoes and plumes helps humanity   
      better understand how Jupiter's complex system of moons, rings, and   
      auroras interact. Juno is scheduled to make two flybys of Io during the   
      coming months that are almost 10 times closer: one in December and   
      another in February 2024.   
      
      Help Wanted: Professional-astronomer level guest writers and assistant   
                                 editors for APOD   
                          Tomorrow's picture: eclipse sky   
        __________________________________________________________________   
      
          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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