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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.   
      
                                 2025 February 26   
       A cluster of galaxies is shown with many galaxies around the cluster   
       center. A close look at this center shows that it is encompassed by a   
        narrow ring of light. Please see the explanation for more detailed   
                                   information.   
      
                   Einstein Ring Surrounds Nearby Galaxy Center   
        Image Credit & Copyright: ESA, NASA, Euclid Consortium; Processing:   
                        J.-C. Cuillandre, G. Anselmi, T. Li   
      
      Explanation: Do you see the ring? If you look very closely at the   
      center of the featured galaxy NGC 6505, a ring becomes evident. It is   
      the gravity of NGC 6505, the nearby (z = 0.042) elliptical galaxy that   
      you can easily see, that is magnifying and distorting the image of a   
      distant galaxy into a complete circle. To create a complete Einstein   
      ring there must be perfect alignment of the nearby galaxy's center and   
      part of the background galaxy. Analysis of this ring and the multiple   
      images of the background galaxy help to determine the mass and fraction   
      of dark matter in NGC 6505's center, as well as uncover previously   
      unseen details in the distorted galaxy. The featured image was captured   
      by ESA's Earth-orbiting Euclid telescope in 2023 and released earlier   
      this month.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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.   
      
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