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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.   
      
                                    2023 May 31   
      
                          Simulation: A Disk Galaxy Forms   
      Video Credit: TNG Collaboration, MPCDF, FAS Harvard U.; Music: World's   
                        Sunrise (YouTube: Jimena Contreras)   
      
      Explanation: How did we get here? We know that we live on a planet   
      orbiting a star orbiting a galaxy, but how did all of this form? Since   
      our universe moves too slowly to watch, faster-moving computer   
      simulations are created to help find out. Specifically, this featured   
      video from the IllustrisTNG collaboration tracks gas from the early   
      universe (redshift 12) until today (redshift 0). As the simulation   
      begins, ambient gas falls into and accumulates in a region of   
      relatively high gravity. After a few billion years, a well-defined   
      center materializes from a strange and fascinating cosmic dance. Gas   
      blobs -- some representing small satellite galaxies -- continue to fall   
      into and become absorbed by the rotating galaxy as the present epoch is   
      reached and the video ends. For the Milky Way Galaxy, however, big   
      mergers may not be over -- recent evidence indicates that our large   
      spiral disk Galaxy will collide and coalesce with the slightly larger   
      Andromeda spiral disk galaxy in the next few billion years.   
      
         Open Science: Browse 3,000+ codes in the Astrophysics Source Code   
                                      Library   
                       Tomorrow's picture: recycling a star   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-6   
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