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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 May 21   
      
                             Planetary Nebula Abell 7   
                Image Credit & Copyright: Donald Waid, Ron Dilulio   
      
      Explanation: Very faint planetary nebula Abell 7 is some 1,800   
      light-years distant, just south of Orion in planet Earth's skies in the   
      constellation Lepus, The Hare. Surrounded by Milky Way stars and near   
      the line-of-sight to distant background galaxies, its generally simple   
      spherical shape, about 8 light-years in diameter, is outlined in this   
      deep telescopic image. Within its confines are beautiful, more complex   
      details enhanced by the use of narrowband filters. Emission from   
      hydrogen is shown in reddish hues with oxygen emission mapped to green   
      and blue colors, giving Abell 7 a natural appearance that would   
      otherwise be much too faint to be appreciated by eye. A planetary   
      nebula represents a very brief final phase in stellar evolution that   
      our own Sun will experience 5 billion years hence, as the nebula's   
      central, once sun-like star shrugs off its outer layers. Abell 7 itself   
      is estimated to be 20,000 years old. Its central star is seen here as a   
      fading white dwarf some 10 billion years old.   
      
                      Tomorrow's picture: Tsunami on the Sun   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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