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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 May 8   
      
                    Visualization: A Black Hole Accretion Disk   
         Visualization Credit: NASACÇÖs Goddard Space Flight Center, Jeremy   
                                    Schnittman   
      
      Explanation: What would it look like to circle a black hole? If the   
      black hole was surrounded by a swirling disk of glowing and accreting   
      gas, then the great gravity of the black hole would deflect light   
      emitted by the disk to make it look very unusual. The featured animated   
      video gives a visualization. The video starts with you, the observer,   
      looking toward the black hole from just above the plane of the   
      accretion disk. Surrounding the central black hole is a thin circular   
      image of the orbiting disk that marks the position of the photon sphere   
      -- inside of which lies the black hole's event horizon. Toward the   
      left, parts of the large main image of the disk appear brighter as they   
      move toward you. As the video continues, you loop over the black hole,   
      soon looking down from the top, then passing through the disk plane on   
      the far side, then returning to your original vantage point. The   
      accretion disk does some interesting image inversions -- but never   
      appears flat. Visualizations such as this are particularly relevant   
      today as black holes are being imaged in unprecedented detail by the   
      Event Horizon Telescope.   
      
               Singularity Impressive: It's Black Hole Week at NASA!   
                       Tomorrow's picture: famous black hole   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
                     NASA Web Privacy, Accessibility, Notices;   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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