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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 December 7   
      
                            NGC 7293: The Helix Nebula   
                     Image Credit & Copyright: Tommaso Stella   
      
      Explanation: A mere seven hundred light years from Earth, toward the   
      constellation Aquarius, a sun-like star is dying. The dying star's last   
      few thousand years have produced the Helix Nebula (NGC 7293), a well   
      studied and nearby example of a Planetary Nebula, typical of this final   
      phase of stellar evolution. Combining narrow band image data from   
      emission lines of hydrogen atoms in red and oxygen atoms in blue-green   
      hues, it shows tantalizing details of the Helix, including its bright   
      inner region about 3 light-years across. The white dot at the Helix's   
      center is this Planetary Nebula's hot, central star. A simple looking   
      nebula at first glance, the Helix is now understood to have a   
      surprisingly complex geometry.   
      
                        Tomorrow's picture: pixels in space   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                                & Michigan Tech. U.   
      
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