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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 October 13   
      
                        Dust Shells around WR 140 from Webb   
      Image Credit: NASA, ESA, CSA, JWST, MIRI, ERS Program 1349; Processing:   
                                   Judy Schmidt   
      
      Explanation: What are those strange rings? Rich in dust, the rings are   
      likely 3D shells -- but how they were created remains a topic of   
      research. Where they were created is well known: in a binary star   
      system that lies about 6,000 light years away toward the constellation   
      of the Swan (Cygnus) -- a system dominated by the Wolf-Rayet star WR   
      140. Wolf-Rayet stars are massive, bright, and known for their   
      tumultuous winds. They are also known for creating and dispersing heavy   
      elements such as carbon which is a building block of interstellar dust.   
      The other star in the binary is also bright and massive -- but not as   
      active. The two great stars joust in an oblong orbit as they approach   
      each other about every eight years. When at closest approach, the X-ray   
      emission from the system increases, as, apparently, does the dust   
      expelled into space -- creating another shell. The featured infrared   
      image by the new Webb Space Telescope resolves greater details and more   
      dust shells than ever before.   
      
                       Tomorrow's picture: falcon and hunter   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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