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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.   
      
                                  2023 January 7   
      
                         Space Stations in Low Earth Orbit   
                      Image Credit & Copyright: Zarcos Palma   
      
      Explanation: On January 3, two space stations already illuminated by   
      sunlight in low Earth orbit crossed this dark predawn sky. Moving west   
      to east (left to right) across the composited timelapse image China's   
      Tiangong Space Station traced the upper trail captured more than an   
      hour before the local sunrise. Seen against a starry background   
      Tiangong passes just below the inverted Big Dipper asterism of Ursa   
      Major near the peak of its bright arc, and above north pole star   
      Polaris. But less than five minutes before, the International Space   
      Station had traced its own sunlit streak across the dark sky. Its trail   
      begins just above the W-shape outlined by the bright stars of   
      Cassiopeia near the northern horizon. The dramatic foreground spans an   
      abandoned mine at Achada do Gamo in southeastern Portugal.   
      
                      Tomorrow's picture: where you come from   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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