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   TZUTC: -0700   
   CHRS: LATIN-1 2   
                           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 May 18   
      
                                WR 134 Ring Nebula   
                      Image Credit & Copyright: Craig Stocks   
      
      Explanation: Made with narrowband filters, this cosmic snapshot covers   
      a field of view about the size of the full Moon within the boundaries   
      of the constellation Cygnus. It highlights the bright edge of a   
      ring-like nebula traced by the glow of ionized sulfur, hydrogen, and   
      oxygen gas. Embedded in the region's interstellar clouds of gas and   
      dust, the complex, glowing arcs are sections of bubbles or shells of   
      material swept up by the wind from Wolf-Rayet star WR 134, brightest   
      star near the center of the frame. Distance estimates put WR 134 about   
      6,000 light-years away, making the frame over 50 light-years across.   
      Shedding their outer envelopes in powerful stellar winds, massive   
      Wolf-Rayet stars have burned through their nuclear fuel at a prodigious   
      rate and end this final phase of massive star evolution in a   
      spectacular supernova explosion. The stellar winds and final supernovae   
      enrich the interstellar material with heavy elements to be incorporated   
      in future generations of stars.   
      
                      Tomorrow's picture: curly spiral galaxy   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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