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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 16   
        A starfield is shown featuring many pillars of interstellar gas and   
          dust, mostly in the center. Please see the explanation for more   
                               detailed information.   
      
                                 Cometary Globules   
       Image Credit & Copyright: Mark Hanson & Martin Pugh, Observatorio El   
                                       Sauce   
      
      Explanation: What are these unusual interstellar structures?   
      Bright-rimmed, flowing shapes gather near the center of this rich   
      starfield toward the borders of the nautical southern constellations   
      Pupis and Vela. Composed of interstellar gas and dust, the grouping of   
      light-year sized cometary globules is about 1300 light-years distant.   
      Energetic ultraviolet light from nearby hot stars has molded the   
      globules and ionized their bright rims. The globules also stream away   
      from the Vela supernova remnant which may have influenced their   
      swept-back shapes. Within them, cores of cold gas and dust are likely   
      collapsing to form low mass stars, whose formation will ultimately   
      cause the globules to disperse. In fact, cometary globule CG 30 (on the   
      upper left) sports a small reddish glow near its head, a telltale sign   
      of energetic jets from a star in the early stages of formation.   
      
                         Tomorrow's picture: volcanic sky   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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