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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 29   
      
                       The Extraordinary Spiral in LL Pegasi   
      Image Credit: NASA, ESA, Hubble, HLA; Processing & Copyright: Jonathan   
                                       Lodge   
      
      Explanation: What created the strange spiral structure on the upper   
      left? No one is sure, although it is likely related to a star in a   
      binary star system entering the planetary nebula phase, when its outer   
      atmosphere is ejected. The huge spiral spans about a third of a light   
      year across and, winding four or five complete turns, has a regularity   
      that is without precedent. Given the expansion rate of the spiral gas,   
      a new layer must appear about every 800 years, a close match to the   
      time it takes for the two stars to orbit each other. The star system   
      that created it is most commonly known as LL Pegasi, but also AFGL 3068   
      and IRAS 23166+1655. The featured image was taken in near-infrared   
      light by the Hubble Space Telescope. Why the spiral glows is itself a   
      mystery, with a leading hypothesis being illumination by light   
      reflected from nearby stars.   
      
                       Tomorrow's picture: planet with moons   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                                & Michigan Tech. U.   
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