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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.   
      
                                    2022 May 1   
      
                     First Horizon-Scale Image of a Black Hole   
                Image Credit: Event Horizon Telescope Collaboration   
      
      Explanation: What does a black hole look like? To find out, radio   
      telescopes from around the Earth coordinated observations of black   
      holes with the largest known event horizons on the sky. Alone, black   
      holes are just black, but these monster attractors are known to be   
      surrounded by glowing gas. This first image resolves the area around   
      the black hole at the center of galaxy M87 on a scale below that   
      expected for its event horizon. Pictured, the dark central region is   
      not the event horizon, but rather the black hole's shadow -- the   
      central region of emitting gas darkened by the central black hole's   
      gravity. The size and shape of the shadow is determined by bright gas   
      near the event horizon, by strong gravitational lensing deflections,   
      and by the black hole's spin. In resolving this black hole's shadow,   
      the Event Horizon Telescope (EHT) bolstered evidence that Einstein's   
      gravity works even in extreme regions, and gave clear evidence that M87   
      has a central spinning black hole of about 6 billion solar masses.   
      Since releasing this featured image in 2019, the EHT has expanded to   
      include more telescopes, observe more black holes, track polarized   
      light,and is working to observe the immediately vicinity of the black   
      hole in the center of our Milky Way Galaxy.   
      
                           This week is: Black Hole Week   
                  New EHT Results to be Announced: Next Thursday   
                          Tomorrow's picture: martian sun   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
      
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