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   CHRS: LATIN-1 2   
                           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 September 24   
      Artwork depicts a colorful version of two black holes nearing collision   
      from between the black holes. Swirling gas is depicted with wavey lined   
      depicting gravitational waves ringing and an artificial grid depicting   
          spacetime shown distorting. Please see the explanation for more   
                               detailed information.   
      
                      GW250114: Rotating Black Holes Collide   
         Illustration Credit: Aurore Simonnet (SSU/EdEon), LVK, URI; LIGO   
                                   Collaboration   
      
      Explanation: It was the strongest gravitational wave signal yet   
      measured -- what did it show? GW250114 was detected by both arms of the   
      Laser Interferometer Gravitational-wave Observatory (LIGO) in   
      Washington and Louisiana USA earlier this year. Analysis showed that   
      the event was created when two black holes, each of mass around 33   
      times the mass of the Sun, coalesced into one larger black hole with a   
      mass of around 63 solar masses. Even though the event happened about a   
      billion light years away, the signal was so strong that the spin of all   
      black holes, as well as initial ringing of the final black hole, was   
      deduced with exceptional accuracy. Furthermore, it was confirmed better   
      than before, as previously predicted, that the total event horizon area   
      of the combined black hole was greater than those of the merging black   
      holes. Featured, an artist's illustration depicts an imaginative and   
      conceptual view from near one of the black holes before collision.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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.   
      
   --- BBBS/Li6 v4.10 Toy-7   
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