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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.   
      
                                   2022 July 31   
      
                         Starburst Galaxy M94 from Hubble   
                          Image Credit: ESA/Hubble & NASA   
      
      Explanation: Why does this galaxy have a ring of bright blue stars?   
      Beautiful island universe Messier 94 lies a mere 15 million light-years   
      distant in the northern constellation of the Hunting Dogs (Canes   
      Venatici). A popular target for Earth-based astronomers, the face-on   
      spiral galaxy is about 30,000 light-years across, with spiral arms   
      sweeping through the outskirts of its broad disk. But this Hubble Space   
      Telescope field of view spans about 7,000 light-years across M94's   
      central region. The featured close-up highlights the galaxy's compact,   
      bright nucleus, prominent inner dust lanes, and the remarkable bluish   
      ring of young massive stars. The ring stars are all likely less than 10   
      million years old, indicating that M94 is a starburst galaxy that is   
      experiencing an epoch of rapid star formation from inspiraling gas. The   
      circular ripple of blue stars is likely a wave propagating outward,   
      having been triggered by the gravity and rotation of a oval matter   
      distributions. Because M94 is relatively nearby, astronomers can better   
      explore details of its starburst ring.   
      
                        Tomorrow's picture: space mountain   
        __________________________________________________________________   
      
          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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