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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 July 5   
      
                           A Molten Galaxy Einstein Ring   
        Image Credit: ESA/Hubble & NASA, S. Jha; Processing: Jonathan Lodge   
      
      Explanation: It is difficult to hide a galaxy behind a cluster of   
      galaxies. The closer cluster's gravity will act like a huge lens,   
      pulling images of the distant galaxy around the sides and greatly   
      distorting them. This is just the case observed in the featured image   
      recently re-processed image from the Hubble Space Telescope. The   
      cluster GAL-CLUS-022058c is composed of many galaxies and is lensing   
      the image of a yellow-red background galaxy into arcs seen around the   
      image center. Dubbed a molten Einstein ring for its unusual shape, four   
      images of the same background galaxy have been identified. Typically, a   
      foreground galaxy cluster can only create such smooth arcs if most of   
      its mass is smoothly distributed -- and therefore not concentrated in   
      the cluster galaxies visible. Analyzing the positions of these   
      gravitational arcs gives astronomers a method to estimate the dark   
      matter distribution in galaxy clusters, as well as infer when the stars   
      in these early galaxies began to form.   
      
      New APOD Social Mirrors in Arabic: On Facebook, Instagram, and Twitter   
                        Tomorrow's picture: star streamers   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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                                & Michigan Tech. U.   
      
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