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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 3   
         A nebula is shown that appears like a firework. Radial filaments   
       connect a glowing halo to a star in the center that appears as a blue   
          dot. Please see the explanation for more detailed information.   
      
                               Unusual Nebula Pa 30   
          Image Credit: NASA, ESA, USAF, NSF; Processing: G. Ferrand (U.   
         Manitoba), J. English (U. Manitoba), R. A. Fesen (Dartmouth), C.   
              Treyturik (U. Manitoba); Text: G. Ferrand & J. English   
      
      Explanation: What created this unusual celestial firework? The nebula,   
      dubbed Pa 30, appears in the same sky direction now as a bright "guest   
      star" did in the year 1181. Although Pa 30's filaments look similar to   
      that created by a nova (for example GK Per), and a planetary nebula   
      (for example NGC 6751), some astronomers now propose that it was   
      created by a rare type of supernova: a thermonuclear Type Iax, and so   
      is (also) named SN 1181. In this model, the supernova was not the   
      result of the detonation of a single star, but rather a blast that   
      occurred when two white dwarf stars spiraled together and merged. The   
      blue dot in the center is hypothesized to be a zombie star, the remnant   
      white dwarf that somehow survived this supernova-level explosion. The   
      featured image combines images and data obtained with infrared (WISE),   
      visible (MDM, Pan-STARRS), and X-ray (Chandra, XMM) telescopes. Future   
      observations and analyses may tell us more.   
      
                NASA Coverage: Total Solar Eclipse of 2024 April 8   
                      Tomorrow's picture: the comet at night   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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