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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 April 3   
       A false-color yellow-on red radio image of our Galactic Center shows   
         yellow radio-emitting arcs above streaks and a bright cocoon that   
       contains our Galaxy's central black hole. Please see the explanation   
                          for more detailed information.   
      
                           The Galactic Center Radio Arc   
                   Image Credit: Ian Heywood (Oxford U.), SARAO;   
      
      Explanation: What causes this unusual curving structure near the center   
      of our Galaxy? The long parallel rays slanting across the top of the   
      featured radio image are known collectively as the Galactic Center   
      Radio Arc and point out from the Galactic plane. The Radio Arc is   
      connected to the Galactic Center by strange curving filaments known as   
      the Arches. The bright radio structure at the bottom right surrounds a   
      black hole at the Galactic Center and is known as Sagittarius A*. One   
      origin hypothesis holds that the Radio Arc and the Arches have their   
      geometry because they contain hot plasma flowing along lines of a   
      constant magnetic field. Images from NASA's Chandra X-ray Observatory   
      appear to show this plasma colliding with a nearby cloud of cold gas.   
      
                        Tomorrow's picture: from inner mars   
        __________________________________________________________________   
      
          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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