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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 August 25   
        A starfield surrounds the bright blue stars of a star cluster: the   
        Pleiades star cluster. Nearly horizontally across the cluster is a   
       bright green streak, most likely a meteor. Please see the explanation   
                          for more detailed information.   
      
                          The Meteor and the Star Cluster   
             Image Credit & Copyright: Yousif Alqasimi & Essa Al Jasmi   
      
      Explanation: Sometimes even the sky surprises you. To see more stars   
      and faint nebulosity in the Pleiades star cluster (M45), long exposures   
      are made. Many times, less interesting items appear on the exposures   
      that were not intended -- but later edited out. These include stuck   
      pixels, cosmic ray hits, frames with bright clouds or Earth's Moon,   
      airplane trails, lens flares, faint satellite trails, and even insect   
      trails. Sometimes, though, something really interesting is caught by   
      chance. That was just the case a few weeks ago in al-Ula, Saudi Arabia   
      when a bright meteor streaked across during an hour-long exposure of   
      the Pleiades. Along with the famous bright blue stars, less famous and   
      less bright blue stars, and blue-reflecting dust surrounding the star   
      cluster, the fast rock fragment created a distinctive green glow,   
      likely due to vaporized metals.   
      
                   Jigsaw Universe: Astronomy Puzzle of the Day   
                          Tomorrow's picture: leaky star   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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