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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 October 15   
      
                                    GRB 221009A   
                 Image Credit: NASA, DOE, Fermi LAT Collaboration   
      
      Explanation: Gamma-ray burst GRB 221009A likely signals the birth of a   
      new black hole, formed at the core of a collapsing star long ago in the   
      distant universe. The extremely powerful blast is depicted in this   
      animated gif constructed using data from the Fermi Gamma Ray Space   
      Telescope. Fermi captured the data at gamma-ray energies, detecting   
      photons with over 100 million electron volts. In comparison visible   
      light photons have energies of about 2 electron volts. A steady, high   
      energy gamma-ray glow from the plane of our Milky Way galaxy runs   
      diagonally through the 20 degree wide frame at the left, while the   
      transient gamma-ray flash from GRB 221009A appears at center and then   
      fades. One of the brightest gamma-ray bursts ever detected GRB 221009A   
      is also close as far as gamma-ray bursts go, but still lies about 2   
      billion light-years away. In low Earth orbit Fermi's Large Area   
      Telescope recorded gamma-ray photons from the burst for more than 10   
      hours as high-energy radiation from GRB 221009A swept over planet Earth   
      last Sunday, October 9.   
      
                         Tomorrow's picture: barred spiral   
        __________________________________________________________________   
      
          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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