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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 October 12   
      
                            Ou4: The Giant Squid Nebula   
                       Image Credit & Copyright: Tommy Lease   
      
      Explanation: A mysterious squid-like cosmic cloud, this nebula is very   
      faint, but also very large in planet Earth's sky. In the image,   
      composed with 30 hours of narrowband image data, it spans nearly three   
      full moons toward the royal constellation Cepheus. Discovered in 2011   
      by French astro-imager Nicolas Outters, the Squid Nebula's bipolar   
      shape is distinguished here by the telltale blue-green emission from   
      doubly ionized oxygen atoms. Though apparently surrounded by the   
      reddish hydrogen emission region Sh2-129, the true distance and nature   
      of the Squid Nebula have been difficult to determine. Still, a more   
      recent investigation suggests Ou4 really does lie within Sh2-129 some   
      2,300 light-years away. Consistent with that scenario, the cosmic squid   
      would represent a spectacular outflow of material driven by a triple   
      system of hot, massive stars, cataloged as HR8119, seen near the center   
      of the nebula. If so, this truly giant squid nebula would physically be   
      over 50 light-years across.   
      
                     Tomorrow's picture: dust shells in space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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