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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 July 4   
      
                               NGC 6946 and NGC 6939   
                    Image Credit & Copyright: Alberto Pisabarro   
      
      Explanation: Face-on spiral galaxy NGC 6946 and open star cluster NGC   
      6939 share this cosmic snapshot, composed with over 68 hours of image   
      data captured with a small telescope on planet Earth. The field of view   
      spans spans about 1 degree or 2 full moons on the sky toward the   
      northern constellation Cepheus. Seen through faint interstellar dust   
      clouds near the plane of our Milky Way galaxy, the stars of open   
      cluster NGC 6939 are 5,600 light-years in the distance, near bottom   
      right in the frame. Face-on spiral galaxy NGC 6946 is at top left, but   
      lies some 22 million light-years away. In the last 100 years, 10   
      supernovae have been discovered in NGC 6946, the latest one seen in   
      2017. By comparison, the average rate of supernovae in our Milky Way is   
      about 1 every 100 years or so. Of course, NGC 6946 is also known as The   
      Fireworks Galaxy.   
      
                          Tomorrow's picture: squid game   
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