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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.   
      
                                   2025 March 2   
      
                  The Hubble Ultra Deep Field in Light and Sound   
       Image Credit: NASA, ESA, Hubble; Sonification: G. Salvesen; Data: M.   
                                  Rafelski et al.   
      
      Explanation: Have you heard about the Hubble Ultra-Deep Field? Either   
      way, you've likely not heard about it like this -- please run your   
      cursor over the featured image and listen! The Hubble Ultra-Deep Field   
      (HUDF) was created in 2003-2004 with the Hubble Space Telescope staring   
      for a long time toward near-empty space so that distant, faint galaxies   
      would become visible. One of the most famous images in astronomy, the   
      HUDF is featured here in a vibrant way -- with sonified distances.   
      Pointing to a galaxy will play a note that indicates its approximate   
      redshift. Because redshifts shift light toward the red end of the   
      spectrum of light, they are depicted here by a shift of tone toward the   
      low end of the spectrum of sound. The further the galaxy, the greater   
      its cosmological redshift (even if it appears blue), and the lower the   
      tone that will be played. The average galaxy in the HUDF is about 10.6   
      billion light years away and sounds like an F#. What's the most distant   
      galaxy you can find?   
      
                      Tomorrow's picture: quadruple alignment   
        __________________________________________________________________   
      
          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.   
      
   --- BBBS/Li6 v4.10 Toy-7   
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