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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 November 21   
      The featured image shows the Butterfly Nebula as imaged by Hubble. The   
       nebula appears very colorful due to a expansive color map used by the   
        digitizing processor. Please see the explanation for more detailed   
                                   information.   
      
                         The Butterfly Nebula from Hubble   
           Image Credit: NASA, ESA, Hubble; Processing: William Ostling   
      
      Explanation: Stars can make beautiful patterns as they age -- sometimes   
      similar to flowers or insects. NGC 6302, the Butterfly Nebula, is a   
      notable example. Though its gaseous wingspan covers over 3 light-years   
      and its estimated surface temperature exceeds 200,000 degrees C, the   
      aging central star of NGC 6302, the featured planetary nebula, has   
      become exceptionally hot, shining brightly in visible and ultraviolet   
      light but hidden from direct view by a dense torus of dust. This sharp   
      close-up was recorded by the Hubble Space Telescope and is processed   
      here to show off remarkable details of the complex planetary nebula,   
      highlighting in particular light emitted by oxygen (shown as blue),   
      hydrogen (green), and nitrogen (red). NGC 6302 lies about 3,500   
      light-years away in the arachnologically correct constellation of the   
      Scorpion (Scorpius). Planetary nebulas evolve from outer atmospheres of   
      stars like our Sun, but usually fade in about 20,000 years.   
      
                         Tomorrow's picture: double space   
        __________________________________________________________________   
      
          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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