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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 June 15   
      
                         M15: Dense Globular Star Cluster   
         Image Credit: NASA, ESA, Hubble Legacy Archive; Processing: Ehsan   
                                    Ebrahimian   
      
      Explanation: Messier 15 is an immense swarm of over 100,000 stars. A 13   
      billion year old relic of the early formative years of our galaxy it's   
      one of about 170 globular star clusters that still roam the halo of the   
      Milky Way. Centered in this sharp reprocessed Hubble image, M15 lies   
      some 35,000 light-years away toward the constellation Pegasus. Its   
      diameter is about 200 light-years, but more than half its stars are   
      packed into the central 10 light-years or so, making one of the densest   
      concentrations of stars known. Hubble-based measurements of the   
      increasing velocities of M15's central stars are evidence that a   
      massive black hole resides at the center of the dense cluster. M15 is   
      also known to harbour a planetary nebula. Called Pease 1 (aka PN Ps 1),   
      it can be seen in this image as a small blue blob below and just right   
      of center.   
      
                       Tomorrow's picture: when time lapses   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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