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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.   
      
                                  2024 August 28   
      A picture of a starfield with red emission nebulae is shown. Toward the   
        right is a point of light that is Cygnus X-1, a nearby black hole.   
      Above the black hole is a blue-shaded bow shock wave in the surrounding   
          gas. Please see the explanation for more detailed information.   
      
                      Tulip Nebula and Black Hole Cygnus X-1   
                     Image Credit & Copyright: Anirudh Shastry   
      
      Explanation: When can you see a black hole, a tulip, and a swan all at   
      once? At night -- if the timing is right, and if your telescope is   
      pointed in the right direction. The complex and beautiful Tulip Nebula   
      blossoms about 8,000 light-years away toward the constellation of   
      Cygnus the Swan. Ultraviolet radiation from young energetic stars at   
      the edge of the Cygnus OB3 association, including O star HDE 227018,   
      ionizes the atoms and powers the emission from the Tulip Nebula.   
      Stewart Sharpless cataloged this nearly 70 light-years across reddish   
      glowing cloud of interstellar gas and dust in 1959, as Sh2-101. Also in   
      the featured field of view is the black hole Cygnus X-1, which to be a   
      microquasar because it is one of strongest X-ray sources in planet   
      Earth's sky. Blasted by powerful jets from a lurking black hole, its   
      fainter bluish curved shock front is only faintly visible beyond the   
      cosmic Tulip's petals, near the right side of the frame.   
      
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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