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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.   
      
                                    2025 May 9   
       An artist's illustration of what the surroundings of the supermassive   
        black hole at the center of BL Lac is shown. A white jet protrudes   
       horizontally toward the bottom of the image, emanating from a orange   
      accretion disk surrounding a black hole. Please see the explanation for   
                            more detailed information.   
      
                          IXPE Explores a Black Hole Jet   
                      Illustration Credit: NASA, Pablo Garcia   
      
      Explanation: How do black holes create X-rays? Answering this   
      long-standing question was significantly advanced recently with data   
      taken by NASACÇÖs IXPE satellite. X-rays cannot exit a black hole, but   
      they can be created in the energetic environment nearby, in particular   
      by a jet of particles moving outward. By observing X-ray light arriving   
      from near the supermassive black hole at the center of galaxy BL Lac,   
      called a blazar, it was discovered that these X-rays lacked significant   
      polarization, which is expected when created more by energetic   
      electrons than protons. In the featured artistic illustration, a   
      powerful jet is depicted emanating from an orange-colored accretion   
      disk circling the black hole. Understanding highly energetic processes   
      across the universe helps humanity to understand similar processes that   
      occur on or near our Earth.   
      
                 Put it All Together: Astronomy Puzzle of the Day   
                       Tomorrow's picture: Yogi on Mars: 3D   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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