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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 2   
      
                             NGC 7023: The Iris Nebula   
                      Image Credit & Copyright: Lorand Fenyes   
      
      Explanation: These cosmic clouds have blossomed 1,300 light-years away   
      in the fertile starfields of the constellation Cepheus. Called the Iris   
      Nebula, NGC 7023 is not the only nebula to evoke the imagery of   
      flowers. Still, this deep telescopic image shows off the Iris Nebula's   
      range of colors and symmetries embedded in surrounding fields of   
      interstellar dust. Within the Iris itself, dusty nebular material   
      surrounds a hot, young star. The dominant color of the brighter   
      reflection nebula is blue, characteristic of dust grains reflecting   
      starlight. Central filaments of the reflection nebula glow with a faint   
      reddish photoluminescence as some dust grains effectively convert the   
      star's invisible ultraviolet radiation to visible red light. Infrared   
      observations indicate that this nebula contains complex carbon   
      molecules known as PAHs. The dusty blue petals of the Iris Nebula span   
      about six light-years.   
      
                       Tomorrow's picture: a cosmic souffle   
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