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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.   
      
                                 2021 November 19   
      
                           NGC 281: Starless with Stars   
       Image Credit & Copyright: Wido Oerlemans - X-ray: Chandra, Infrared:   
                                      Spitzer   
      
      Explanation: In visible light the stars have been removed from this   
      narrow-band image of NGC 281, a star forming region some 10,000   
      light-years away toward the constellation Cassiopeia. Stars were   
      digitally added back to the resulting starless image though. But   
      instead of using visible light image data, the stars were added with   
      X-ray data (in purple) from the Chandra X-ray Observatory and infrared   
      data (in red) from the Spitzer Space Telescope. The merged   
      multiwavelength view reveals a multitude of stars in the region's   
      embedded star cluster IC 1590. The young stars are normally hidden in   
      visible light images by the natal cloud's gas and obscuring dust. Also   
      known to backyard astro-imagers as the Pacman Nebula for its overall   
      appearance in visible light, NGC 281 is about 80 light-years across.   
      
                         Tomorrow's picture: light-weekend   
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