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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 August 13   
      A bright nebula occupies the center of the frame. The nebula is complex   
       but roughly tan in the center and red around the edges. In the center   
          are four bright blue stars. Please see the explanation for more   
                               detailed information.   
      
                         Trapezium: In the Heart of Orion   
       Image Credit: Data: Hubble Legacy Archive, Processing: Robert Gendler   
      
      Explanation: What lies in the heart of Orion? Trapezium: four bright   
      stars, that can be found near the center of this sharp cosmic portrait.   
      Gathered within a region about 1.5 light-years in radius, these stars   
      dominate the core of the dense Orion Nebula Star Cluster. Ultraviolet   
      ionizing radiation from the Trapezium stars, mostly from the brightest   
      star Theta-1 Orionis C powers the complex star forming region's entire   
      visible glow. About three million years old, the Orion Nebula Cluster   
      was even more compact in its younger years and a dynamical study   
      indicates that runaway stellar collisions at an earlier age may have   
      formed a black hole with more than 100 times the mass of the Sun. The   
      presence of a black hole within the cluster could explain the observed   
      high velocities of the Trapezium stars. The Orion Nebula's distance of   
      some 1,500 light-years make it one of the closest candidate black holes   
      to Earth.   
      
          Tomorrow's picture: when the Sky is serene and the Moon absent   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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