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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 October 13   
      
                              Hydrogen Clouds of M33   
                    Image Credit & Copyright: Reinhold Wittich   
      
      Explanation: Gorgeous spiral galaxy Messier 33 seems to have more than   
      its fair share of glowing hydrogen gas. A prominent member of the local   
      group of galaxies, M33 is also known as the Triangulum Galaxy and lies   
      a mere 3 million light-years away. The galaxy's central 30,000   
      light-years or so are shown in this sharp galaxy portrait. The portrait   
      features M33's reddish ionized hydrogen clouds or HII regions.   
      Sprawling along loose spiral arms that wind toward the core, M33's   
      giant HII regions are some of the largest known stellar nurseries,   
      sites of the formation of short-lived but very massive stars. Intense   
      ultraviolet radiation from the luminous, massive stars ionizes the   
      surrounding hydrogen gas and ultimately produces the characteristic red   
      glow. In this image, broadband data were combined with narrowband data   
      recorded through a hydrogen-alpha filter. That filter transmits the   
      light of the strongest visible hydrogen emission line.   
      
                      Tomorrow's picture: ring around the Sun   
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