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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 27   
      
                        Open Star Clusters M35 and NGC 2158   
         Image Credit & Copyright: Evan Tsai, LATTE: Lulin-ASIAA Telescope   
      
      Explanation: Framed in this single, starry, telescopic field of view   
      are two open star clusters, M35 and NGC 2158. Located within the   
      boundaries of the constellation Gemini, they do appear to be side by   
      side. Its stars concentrated toward the upper right, M35 is relatively   
      nearby, though. M35 (also cataloged as NGC 2168) is a mere 2800   
      light-years distant, with 400 or so stars spread out over a volume   
      about 30 light-years across. Bright blue stars frequently distinguish   
      younger open clusters like M35, whose age is estimated at 150 million   
      years. At lower left, NGC 2158 is about four times more distant than   
      M35 and much more compact, shining with the more yellowish light of a   
      population of stars over 10 times older. In general, open star clusters   
      are found along the plane of our Milky Way Galaxy. Loosely   
      gravitationally bound, their member stars tend to be dispersed over   
      billions of years as the open star clusters orbit the galactic center.   
      
                        Tomorrow's picture: pixels in space   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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