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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.
                  NASA Web Privacy, Accessibility, Notices;
                      A service of: ASD at NASA / GSFC,
                           NASA Science Activation
                             & Michigan Tech. U.

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