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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 October 20   
      A complicated web of dark filaments is seen against a light background.   
      When many filmaments intersect, an orange spot is seen. Please see the   
                    explanation for more detailed information.   
      
                        Dark Matter in a Simulated Universe   
      Illustration Credit & Copyright: Tom Abel & Ralf Kaehler (KIPAC, SLAC),   
                                       AMNH   
      
      Explanation: Is our universe haunted? It might look that way on this   
      dark matter map. The gravity of unseen dark matter is the leading   
      explanation for why galaxies rotate so fast, why galaxies orbit   
      clusters so fast, why gravitational lenses so strongly deflect light,   
      and why visible matter is distributed as it is both in the local   
      universe and on the cosmic microwave background. The featured image   
      from the American Museum of Natural History's Hayden Planetarium Space   
      Show Dark Universe highlights one example of how pervasive dark matter   
      might haunt our universe. In this frame from a detailed computer   
      simulation, complex filaments of dark matter, shown in black, are   
      strewn about the universe like spider webs, while the relatively rare   
      clumps of familiar baryonic matter are colored orange. These   
      simulations are good statistical matches to astronomical observations.   
      In what is perhaps a scarier turn of events, dark matter -- although   
      quite strange and in an unknown form -- is no longer thought to be the   
      strangest source of gravity in the universe. That honor now falls to   
      dark energy, a more uniform source of repulsive gravity that seems to   
      now dominate the expansion of the entire universe.   
      
                   Explore Your Universe: Random APOD Generator   
                          Tomorrow's picture: anti-comet   
        __________________________________________________________________   
      
          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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