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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.   
      
                                  2022 January 26   
      
                         Stars, Dust, and Gas Near Antares   
                 Image Credit & Copyright: Mario Cogo (Galax Lux)   
      
      Explanation: Why is the sky near Antares and Rho Ophiuchi so dusty yet   
      colorful? The colors result from a mixture of objects and processes.   
      Fine dust -- illuminated from the front by starlight -- produces blue   
      reflection nebulae. Gaseous clouds whose atoms are excited by   
      ultraviolet starlight produce reddish emission nebulae. Backlit dust   
      clouds block starlight and so appear dark. Antares, a red supergiant   
      and one of the brighter stars in the night sky, lights up the   
      yellow-red clouds on the lower right of the featured image. The Rho   
      Ophiuchi star system lies at the center of the blue reflection nebula   
      on the top left. The distant globular cluster of stars M4 is visible   
      above and to the right of Antares. These star clouds are even more   
      colorful than humans can see, emitting light across the electromagnetic   
      spectrum.   
      
                          Tomorrow's picture: open space   
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