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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 June 13   
      
                                  Rubin's Galaxy   
          Image Credit: NASA, ESA, B. Holwerda (University of Louisville)   
      
      Explanation: In this Hubble Space Telescope image the bright, spiky   
      stars lie in the foreground toward the heroic northern constellation   
      Perseus and well within our own Milky Way galaxy. In sharp focus beyond   
      is UGC 2885, a giant spiral galaxy about 232 million light-years   
      distant. Some 800,000 light-years across compared to the Milky Way's   
      diameter of 100,000 light-years or so, it has around 1 trillion stars.   
      That's about 10 times as many stars as the Milky Way. Part of an   
      investigation to understand how galaxies can grow to such enormous   
      sizes, UGC 2885 was also part of An Interesting Voyage and American   
      astronomer Vera Rubin's pioneering study of the rotation of spiral   
      galaxies. Her work was the first to convincingly demonstrate the   
      dominating presence of dark matter in our universe. A new U.S. coin has   
      been issured to honor Vera Rubin, while the Vera C. Rubin Observatory   
      is scheduled to unveil images from its first look at the cosmos on June   
      23.   
      
                        Tomorrow's picture: criss-crossing   
        __________________________________________________________________   
      
          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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