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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 January 27   
        A cluster of bright blue stars is seen on the upper right while an   
       unusual dome-like mountain occupies most of the frame. Please see the   
                    explanation for more detailed information.   
      
                              Pleiades over Half Dome   
                   Image Credit & Copyright: Dheera Venkatraman   
      
      Explanation: Stars come in bunches. The most famous bunch of stars on   
      the sky is the Pleiades, a bright cluster that can be easily seen with   
      the unaided eye. The Pleiades lies only about 450 light years away,   
      formed about 100 million years ago, and will likely last about another   
      250 million years. Our Sun was likely born in a star cluster, but now,   
      being about 4.5 billion years old, its stellar birth companions have   
      long since dispersed. The Pleiades star cluster is pictured over Half   
      Dome, a famous rock structure in Yosemite National Park in California,   
      USA. The featured image is a composite of 28 foreground exposures and   
      174 images of the stellar background, all taken from the same location   
      and by the same camera on the same night in October 2019. After   
      calculating the timing of a future juxtaposition of the Pleiades and   
      Half Dome, the astrophotographer was unexpectedly rewarded by an   
      electrical blackout, making the background sky unusually dark.   
      
       Astrophysicists: Browse 3,500+ codes in the Astrophysics Source Code   
                                      Library   
                           Tomorrow's picture: big comet   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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