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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 April 9   
      
                         The Egg Nebula in Polarized Light   
      Image Credit: Hubble Heritage Team (STScI / AURA), W. Sparks (STScI) &   
                               R. Sahai (JPL), NASA   
      
      Explanation: Where is the center of the Egg Nebula? Emerging from a   
      cosmic egg, the star in the center of the Egg Nebula is casting away   
      shells of gas and dust as it slowly transforms itself into a white   
      dwarf star. The Egg Nebula is a rapidly evolving pre- planetary nebula   
      spanning about one light year. It lies some 3,000 light-years away   
      toward the northern constellation Cygnus. Thick dust blocks the center   
      star from view, while the dust shells farther out reflect light from   
      this star. Light vibrating in the plane defined by each dust grain, the   
      central star, and the observer is preferentially reflected, causing an   
      effect known as polarization. Measuring the orientation of the   
      polarized light for the Egg Nebula gives clues to location of the   
      hidden source. Taken by Hubble's Advanced Camera for Surveys   
      in 2002, this image is rendered in artifical "Easter-Egg" colors coded   
      to highlight the orientation of polarization.   
      
                          Tomorrow's picture: big chicken   
        __________________________________________________________________   
      
          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,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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