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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 September 12   
      
                        Galaxy Cluster Abell 370 and Beyond   
          Image Credit: NASA, ESA, Jennifer Lotz and the HFF Team (STScI)   
      
      Explanation: Some 4 billion light-years away, massive galaxy cluster   
      Abell 370 is captured in this sharp Hubble Space Telescope snapshot.   
      The cluster of galaxies only appears to be dominated by two giant   
      elliptical galaxies and infested with faint arcs. In reality, the   
      fainter, scattered bluish arcs, along with the dramatic dragon arc   
      below and left of center, are images of galaxies that lie far beyond   
      Abell 370. About twice as distant, their otherwise undetected light is   
      magnified and distorted by the cluster's enormous gravitational mass,   
      overwhelmingly dominated by unseen dark matter. Providing a tantalizing   
      glimpse of galaxies in the early universe, the effect is known as   
      gravitational lensing. A consequence of warped spacetime, lensing was   
      predicted by Einstein almost a century ago. Far beyond the spiky   
      foreground Milky Way star at lower right, Abell 370 is seen toward the   
      constellation Cetus, the Sea Monster. It was the last of six galaxy   
      clusters imaged in the Frontier Fields project.   
      
                         Tomorrow's picture: partly hidden   
        __________________________________________________________________   
      
          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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