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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 May 8   
      
                      Spiral Galaxy NGC 1512: The Inner Rings   
                  Image Credit: NASA, ESA, Hubble Space Telescope   
      
      Explanation: Most galaxies don't have any rings -- why does this galaxy   
      have two? To begin, the bright band near NGC 1512's center is a nuclear   
      ring, a ring that surrounds the galaxy center and glows brightly with   
      recently formed stars. Most stars and accompanying gas and dust,   
      however, orbit the galactic center in a ring much further out -- here   
      seen near the image edge. This ring is called, counter-intuitively, the   
      inner ring. If you look closely, you will see this the inner ring   
      connects ends of a diffuse central bar that runs horizontally across   
      the galaxy. These ring structures are thought to be caused by NGC   
      1512's own asymmetries in a drawn-out process called secular evolution.   
      The gravity of these galaxy asymmetries, including the bar of stars,   
      cause gas and dust to fall from the inner ring to the nuclear ring,   
      enhancing this ring's rate of star formation. Some spiral galaxies also   
      have a third ring -- an outer ring that circles the galaxy even further   
      out.   
      
                        Tomorrow's picture: martian eclipse   
        __________________________________________________________________   
      
          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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