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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 August 5   
      
                                A Beautiful Trifid   
                      Image Credit & Copyright: Vikas Chander   
      
      Explanation: The beautiful Trifid Nebula is a cosmic study in   
      contrasts. Also known as M20, it lies about 5,000 light-years away   
      toward the nebula rich constellation Sagittarius. A star forming region   
      in the plane of our galaxy, the Trifid does illustrate three different   
      types of astronomical nebulae; red emission nebulae dominated by light   
      from hydrogen atoms, blue reflection nebulae produced by dust   
      reflecting starlight, and dark nebulae where dense dust clouds appear   
      in silhouette. But the red emission region, roughly separated into   
      three parts by obscuring dust lanes, is what lends the Trifid its   
      popular name. Pillars and jets sculpted by newborn stars, above and   
      right of the emission nebula's center, appear in famous Hubble Space   
      Telescope close-up images of the region. The Trifid Nebula is about 40   
      light-years across. Too faint to be seen by the unaided eye, it almost   
      covers the area of a full moon in planet Earth's sky. Open star cluster   
      M21 just peeks into this telescopic field of view along the bottom   
      right edge of the frame.   
      
                   Tomorrow's picture: the grooved moon of Mars   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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