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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.   
      
                                    2023 May 3   
        A long duration image of the unusual galaxy Centaurus A. The galaxy   
       appears as a light oval with a complex dark dust lane running across   
           its center. A starfield surrounds the galaxy. Please see the   
                    explanation for more detailed information.   
      
                      Centaurus A: A Peculiar Island of Stars   
       Image Credit & Copyright: Marco Lorenzi, Angus Lau & Tommy Tse; Text:   
                         Natalia Lewandowska (SUNY Oswego)   
      
      Explanation: Galaxies are fascinating. In galaxies, gravity alone holds   
      together massive collections of stars, dust, interstellar gas, stellar   
      remnants and dark matter. Pictured is NGC 5128, better known as   
      Centaurus A. Cen A is the fifth brightest galaxy on the sky and is   
      located at a distance of about 12 million light years from Earth. The   
      warped shape of Cen A is the result of a merger between an elliptical   
      and a spiral galaxy. Its active galactic nucleus harbors a supermassive   
      black hole that is about 55 million times more massive than our Sun.   
      This central black hole ejects a fast jet visible in both radio and   
      X-ray light. Filaments of the jet are visible in red in the upper left.   
      New observations by the Event Horizon Telescope have revealed a   
      brightening of the jet only towards its edges -- but for reasons that   
      are currently unknown and an active topic of research.   
      
                           At NASA it's: Black Hole Week   
                     Tomorrow's picture: black hole revisited   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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