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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.   
      
                                 2021 November 12   
      
                            M33: The Triangulum Galaxy   
                     Image Credit & Copyright: Bernard Miller   
      
      Explanation: The small, northern constellation Triangulum harbors this   
      magnificent face-on spiral galaxy, M33. Its popular names include the   
      Pinwheel Galaxy or just the Triangulum Galaxy. M33 is over 50,000   
      light-years in diameter, third largest in the Local Group of galaxies   
      after the Andromeda Galaxy (M31), and our own Milky Way. About 3   
      million light-years from the Milky Way, M33 is itself thought to be a   
      satellite of the Andromeda Galaxy and astronomers in these two galaxies   
      would likely have spectacular views of each other's grand spiral star   
      systems. As for the view from planet Earth, this sharp image shows off   
      M33's blue star clusters and pinkish star forming regions along the   
      galaxy's loosely wound spiral arms. In fact, the cavernous NGC 604 is   
      the brightest star forming region, seen here at about the 4 o'clock   
      position from the galaxy center. Like M31, M33's population of   
      well-measured variable stars have helped make this nearby spiral a   
      cosmic yardstick for establishing the distance scale of the Universe.   
      
                              Tomorrow's picture: 67P   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
      
      
      
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