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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 28   
      
                   Solar X Flare as Famous Active Region Returns   
                  Video Credit: NASA, Solar Dynamics Observatory   
      
      Explanation: It's back. The famous active region on the Sun that   
      created auroras visible around the Earth earlier this month has   
      survived its rotation around the far side of the Sun -- and returned.   
      Yesterday, as it was beginning to reappear on the Earth-facing side,   
      the region formerly labeled AR 3664 threw another major solar flare,   
      again in the highest-energy X-class range. The featured video shows the   
      emerging active region on the lower left, as it was captured by NASA's   
      Earth-orbiting Solar Dynamics Observatory yesterday in ultraviolet   
      light. The video is a time-lapse of the entire Sun rotating over 24   
      hours. Watch the lower-left region carefully at about the 2-second mark   
      to see the powerful flare burst out. The energetic particles from that   
      flare and associated CME are not expected to directly impact the Earth   
      and trigger impressive auroras, but scientists will keep a close watch   
      on this unusually active region over the next two weeks, as it faces   
      the Earth, to see what develops.   
      
                         Tomorrow's picture: stairway to CǪ   
        __________________________________________________________________   
      
          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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