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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 30   
        A ball of stars containing thousands of stars is shown with mostly   
       light colored stars but with some stars having vibrant colors. Please   
                see the explanation for more detailed information.   
      
                    Globular Star Cluster NGC 6355 from Hubble   
               Image Credit: ESA/Hubble & NASA, E. Noyola, R. Cohen   
      
      Explanation: Globular clusters once ruled the Milky Way. Back in the   
      old days, back when our Galaxy first formed, perhaps thousands of   
      globular clusters roamed our Galaxy. Today, there are less than 200   
      left. Over the eons, many globular clusters were destroyed by repeated   
      fateful encounters with each other or the Galactic center. Surviving   
      relics are older than any Earth fossil, older than any other structures   
      in our Galaxy, and limit the universe itself in raw age. There are few,   
      if any, young globular clusters left in our Milky Way Galaxy because   
      conditions are not ripe for more to form. The featured image shows a   
      Hubble Space Telescope view of 13-billion year old NGC 6355, a   
      surviving globular cluster currently passing near the Milky Way's   
      center. Globular cluster stars are concentrated toward the image center   
      and highlighted by bright blue stars. Most other stars in the frame are   
      dimmer, redder, and just coincidently lie near the direction to NGC   
      6355.   
      
                          Tomorrow's picture: tails tales   
        __________________________________________________________________   
      
          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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