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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.   
      
                                   2025 July 29   
        A nearly circular nebula with a blue core surrounded by small white   
         knots, an orange ring and expansive red strucures. Please see the   
                    explanation for more detailed information.   
      
                             A Helix Nebula Deep Field   
                  Image Credit & Copyright: George Chatzifrantzis   
      
      Explanation: Is the Helix Nebula looking at you? No, not in any   
      biological sense, but it does look quite like an eye. The Helix Nebula   
      is so named because it also appears that you are looking down the axis   
      of a helix. In actuality, it is now understood to have a surprisingly   
      complex geometry, including radial filaments and extended outer loops.   
      The Helix Nebula (aka NGC 7293) 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 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 featured picture, taken in   
      red, green, and blue but highlighted by light emitted primarily by   
      hydrogen was created from 12 hours of exposure through a personal   
      telescope located in Greece. A close-up of the inner edge of the Helix   
      Nebula shows complex gas knots the origin of which are still being   
      researched.   
      
                      Portal Universe: Random APOD Generator   
                           Tomorrow's picture: loopy Sun   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                                & Michigan Tech. U.   
      
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