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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 May 7   
       A colorful circular nebula is shown that is beige in the center, red   
        further out, and gas violet rings even further out. Please see the   
                    explanation for more detailed information.   
      
                            The Helix Nebula from CFHT   
       Image Credit: CFHT, Coelum, MegaCam, J.-C. Cuillandre (CFHT) & G. A.   
                                 Anselmi (Coelum)   
      
      Explanation: Will our Sun look like this one day? The Helix Nebula is   
      one of brightest and closest examples of a planetary nebula, a gas   
      cloud created at the end of the life of a Sun-like star. The outer   
      gasses of the star expelled into space appear from our vantage point as   
      if we are looking down a helix. The remnant central stellar core,   
      destined to become a white dwarf star, glows in light so energetic it   
      causes the previously expelled gas to fluoresce. The Helix Nebula,   
      given a technical designation of NGC 7293, lies about 700 light-years   
      away towards the constellation of the Water Bearer (Aquarius) and spans   
      about 2.5 light-years. The featured picture was taken with the   
      Canada-France-Hawaii Telescope (CFHT) located atop a dormant volcano in   
      Hawaii, USA. A close-up of the inner edge of the Helix Nebula shows   
      complex gas knots of unknown origin.   
      
                        Tomorrow's picture: dancing galaxy   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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