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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 September 6   
      
                    HESS Telescopes Explore the High-Energy Sky   
      Credit & Copyright: Video Credit & Copyright: Jeff Dai (TWAN), H.E.S.S.   
                                  Collaboration;   
            Music: Ibaotu catalog number 1044988 (Used with permission)   
      
      Explanation: They may look like modern mechanical dinosaurs, but they   
      are enormous swiveling eyes that watch the sky. The High Energy   
      Stereoscopic System (H.E.S.S.) Observatory is composed of four 12-meter   
      reflecting-mirror telescopes surrounding a larger telescope housing a   
      28-meter mirror. They are designed to detect strange flickers of blue   
      light -- Cherenkov radiation --emitted when charged particles move   
      slightly faster than the speed of light in air. This light is emitted   
      when a gamma ray from a distant source strikes a molecule in Earth's   
      atmosphere and starts a charged-particle shower. H.E.S.S. is sensitive   
      to some of the highest energy photons (TeV) crossing the universe.   
      Operating since 2003 in Namibia, H.E.S.S. has searched for dark matter   
      and has discovered over 50 sources emitting high energy radiation   
      including supernova remnants and the centers of galaxies that contain   
      supermassive black holes. Pictured in June, H.E.S.S. telescopes swivel   
      and stare in time-lapse sequences shot in front of our Milky Way Galaxy   
      and the Magellanic Clouds -- as the occasional Earth-orbiting satellite   
      zips by.   
      
                     Surf the Universe: Random APOD Generator   
                       Tomorrow's picture: large star cloud   
        __________________________________________________________________   
      
          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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