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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 January 11   
       A green aurora is pictured above and beyond a dark rocky arch. Faint   
      stars dot the background. Please see the explanation for more detailed   
                                   information.   
      
                            Spiral Aurora over Iceland   
                   Image Credit & Copyright: Stefano Pellegrini   
      
      Explanation: The scene may look like a fantasy, but it's really   
      Iceland. The rock arch is named Gatklettur and located on the island's   
      northwest coast. Some of the larger rocks in the foreground span a   
      meter across. The fog over the rocks is really moving waves averaged   
      over long exposures. The featured image is a composite of several   
      foreground and background shots taken with the same camera and from the   
      same location on the same night last November. The location was picked   
      for its picturesque foreground, but the timing was planned for its   
      colorful background: aurora. The spiral aurora, far behind the arch,   
      was one of the brightest seen in the astrophotographer's life. The   
      coiled pattern was fleeting, though, as auroral patterns waved and   
      danced for hours during the cold night. Far in the background were the   
      unchanging stars, with Earth's rotation causing them to appear to   
      slowly circle the sky's northernmost point near Polaris.   
      
        Your Sky Surprise: What picture did APOD feature on your birthday?   
                                    (post 1995)   
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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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