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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.   
      
                                   2024 April 30   
        A faint nebula runs vertically in the image. In the center is a red   
       envelope surrounding diffuse blue emission. In the center is a bright   
      multicolored nebula that is nearly circular. Please see the explanation   
                          for more detailed information.   
      
                         GK Per: Nova and Planetary Nebula   
                   Image Credit & Copyright: Deep Sky Collective   
      
      Explanation: The star system GK Per is known to be associated with only   
      two of the three nebulas pictured. At 1500 light years distant, Nova   
      Persei 1901 (GK Persei) was the second closest nova yet recorded. At   
      the very center is a white dwarf star, the surviving core of a former   
      Sun-like star. It is surrounded by the circular Firework nebula, gas   
      that was ejected by a thermonuclear explosion on the white dwarf's   
      surface -- a nova -- as recorded in 1901. The red glowing gas   
      surrounding the Firework nebula is the atmosphere that used to surround   
      the central star. This gas was expelled before the nova and appears as   
      a diffuse planetary nebula. The faint gray gas running across is   
      interstellar cirrus that seems to be just passing through coincidently.   
      In 1901, GK Per's nova became brighter than Betelgeuse. Similarly, star   
      system T CrB is expected to erupt in a nova later this year, but we   
      don't know exactly when nor how bright it will become.   
      
                           Tomorrow's picture: sky fish   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                                & Michigan Tech. U.   
      
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