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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 March 25   
      
                 Sonified: The Jellyfish Nebula Supernova Remnant   
         Image Credit: X-ray (blue): Chandra (NASA) & ROSAT (ESA); Optical   
       (red): DSS (NSF); Radio (green): VLA (NRAO, NSF); Sonification: NASA,   
           CXC, SAO, K. Arcand; SYSTEM Sounds: M. Russo, A. Santaguida)   
      
      Explanation: What does a supernova remnant sound like? Although sound   
      is a compression wave in matter and does not carry into empty space,   
      interpretive sound can help listeners appreciate and understand a   
      visual image of a supernova remnant in a new way. Recently, the   
      Jellyfish Nebula (IC 443) has been sonified quite creatively. In the   
      featured sound-enhanced video, when an imaginary line passes over a   
      star, the sound of a drop falling into water is played, a sound   
      particularly relevant to the nebula's aquatic namesake. Additionally,   
      when the descending line crosses gas that glows red, a low tone is   
      played, while green sounds a middle tone, and blue produces a tone with   
      a relatively high pitch. Light from the supernova that created the   
      Jellyfish Nebula left approximately 35,000 years ago, when humanity was   
      in the stone age. The nebula will slowly disperse over the next million   
      years, although the explosion also created a dense neutron star which   
      will remain indefinitely.   
      
                          Tomorrow's picture: comet tails   
        __________________________________________________________________   
      
          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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