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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 April 21   
        What looks like a single spiral galaxy is shown with a white center   
         surrounded by inner blue arms and outer red arms. Please see the   
                    explanation for more detailed information.   
      
                          Galaxy Lenses Galaxy from Webb   
                   Image Credit: ESA/Webb, NASA & CSA, G. Mahler   
      
      Explanation: Is this one galaxy or two? Although it looks like one, the   
      answer is two. One path to this happening is when a small galaxy   
      collides with a larger galaxy and ends up in the center. But in the   
      featured image, something more rare is going on. Here, the central   
      light-colored elliptical galaxy is much closer than the blue and   
      red-colored spiral galaxy that surrounds it. This can happen when near   
      and far galaxies are exactly aligned, causing the gravity of the near   
      galaxy to pull the light from the far galaxy around it in an effect   
      called gravitational lensing. The featured galaxy double was taken by   
      the Webb Space Telescope and shows a complete Einstein ring, with great   
      detail visible for both galaxies. Galaxy lenses like this can reveal   
      new information about the mass distribution of the foreground lens and   
      the light distribution of the background source.   
      
                        Tomorrow's picture: terminator moon   
        __________________________________________________________________   
      
          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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