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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 November 8   
       The featured image shows a several interacting spiral galaxies with a   
       bridge of stars and gas connecting the two brightest galaxies. Please   
                see the explanation for more detailed information.   
      
                       Galaxies: Wild's Triplet from Hubble   
                    Image Credit: ESA/Hubble, NASA, Dark Energy   
             Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA, J. Dalcanton   
      
      Explanation: How many galaxies are interacting here? This grouping of   
      galaxies is called the Wild Triplet, not only for the discoverer, but   
      for the number of bright galaxies that appear. It had been assumed that   
      all three galaxies, collectively cataloged as Arp 248, are interacting,   
      but more recent investigations reveal that only the brightest two   
      galaxies are sparring gravitationally: the big galaxies at the top and   
      bottom. The spiral galaxy in the middle of the featured image by the   
      Hubble Space Telescope is actually far in the distance, as is the   
      galaxy just below it and all of the other numerous galaxies in the   
      field. A striking result of these giants jousting is a tremendous   
      bridge of stars, gas, and dust that stretches between them -- a bridge   
      almost 200,000 light-years long. Light we see today from Wild's Triplet   
      left about 200 million years ago, when dinosaurs roamed the Earth. In   
      perhaps a billion years or so, the two interacting galaxies will merge   
      to form a single large spiral galaxy.   
      
                        Tomorrow's picture: nebular mystery   
        __________________________________________________________________   
      
          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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