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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 September 27   
      
                       Stellar Streams in the Local Universe   
                    Image Credit: David Martinez Delgado et al.   
      
      Explanation: The twenty galaxies arrayed in these panels are part of an   
      ambitious astronomical survey of tidal stellar streams. Each panel   
      presents a composite view; a deep, inverted image taken from publicly   
      available imaging surveys of a field that surrounds a nearby massive   
      galaxy image. The inverted images reveal faint cosmic structures, star   
      streams hundreds of thousands of light-years across, that result from   
      the gravitational disruption and eventual merger of satellite galaxies   
      in the local universe. Such surveys of mergers and gravitational tidal   
      interactions between massive galaxies and their dwarf satellites are   
      crucial guides for current models of galaxy formation and cosmology. Of   
      course, the detection of stellar streams in the neighboring Andromeda   
      Galaxy and our own Milky Way also offers spectacular evidence for   
      ongoing satellite galaxy disruption within our more local galaxy group.   
      
                       Tomorrow's picture: eclipse at sunset   
        __________________________________________________________________   
      
          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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