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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.   
      
                                    2024 July 6   
      
                             NGC 7789: Caroline's Rose   
                    Image Credit & Copyright: Massimo Di Fusco   
      
      Explanation: Found among the rich starfields of the Milky Way, star   
      cluster NGC 7789 lies about 8,000 light-years away toward the   
      constellation Cassiopeia. A late 18th century deep sky discovery of   
      astronomer Caroline Lucretia Herschel, the cluster is also known as   
      Caroline's Rose. Its visual appearance in small telescopes, created by   
      the cluster's complex of stars and voids, is suggestive of nested rose   
      petals. Now estimated to be 1.6 billion years young, the galactic or   
      open cluster of stars also shows its age. All the stars in the cluster   
      were likely born at the same time, but the brighter and more massive   
      ones have more rapidly exhausted the hydrogen fuel in their cores.   
      These have evolved from main sequence stars like the Sun into the many   
      red giant stars shown with a yellowish cast in this color composite.   
      Using measured color and brightness, astronomers can model the mass and   
      hence the age of the cluster stars just starting to "turn off" the main   
      sequence and become red giants. Over 50 light-years across, Caroline's   
      Rose spans about half a degree (the angular size of the Moon) near the   
      center of the sharp telescopic image.   
      
                         Tomorrow's picture: cloudy skies   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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