Astronomy Picture of the Day

   [1]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

     IFRAME: [2]https://apod.nasa.gov/apod/image/1803/AstroSoM/hudf.html

               The Hubble Ultra Deep Field in Light and Sound
   Image Credit: [3]NASA, [4]ESA, [5]Hubble; Sonification: [6]G. Salvesen;
                         Data: [7]M. Rafelski et al.

   Explanation: Have you heard about the Hubble Ultra-Deep Field? Either
   way, you've likely not [8]heard about it like this -- please run your
   cursor over the featured image and listen! The [9]Hubble Ultra-Deep
   Field (HUDF) was created in 2003-2004 with the [10]Hubble Space
   Telescope staring for a long time toward near-empty space so that
   distant, [11]faint galaxies would become visible. One of the most
   famous images in astronomy, the [12]HUDF is featured here in a vibrant
   way -- with sonified distances. Pointing to a galaxy will play a
   [13]note that indicates its approximate redshift. Because [14]redshifts
   shift light toward the red end of the [15]spectrum of light, they are
   depicted here by a shift of tone toward the low end of the [16]spectrum
   of sound. The further the galaxy, the greater its [17]cosmological
   redshift (even if it appears blue), and the lower the tone that will be
   played. The average galaxy in the [18]HUDF is about 10.6 billion
   [19]light years away and sounds like an [20]F#. What's the [21]most
   distant galaxy you can find?

                   Tomorrow's picture: quadruple alignment
     __________________________________________________________________

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    Authors & editors: [33]Robert Nemiroff ([34]MTU) & [35]Jerry Bonnell
                                 ([36]UMCP)
          NASA Official: Amber Straughn [37]Specific rights apply.
            [38]NASA Web Privacy, [39]Accessibility, [40]Notices;
                A service of: [41]ASD at [42]NASA / [43]GSFC,
                         [44]NASA Science Activation
                           & [45]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1803/AstroSoM/hudf.html
   3. https://www.nasa.gov/
   4. https://www.esa.int/
   5. https://science.nasa.gov/mission/hubble/
   6. https://www.colorado.edu/aps/greg-salvesen
   7. https://ui.adsabs.harvard.edu/abs/2015AJ....150...31R/abstract
   8. https://i.pinimg.com/564x/33/63/f6/3363f6be8a0b534cd852395723dd6700.jpg
   9. https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field
  10. https://science.nasa.gov/mission/hubble/overview/about-hubble/
  11. https://esahubble.org/science/deep_fields/
  12. https://apod.nasa.gov/apod/ap040309.html
  13. https://en.wikipedia.org/wiki/Musical_note
  14. https://www.youtube.com/watch?v=8U4O8XB14tg
  15. https://science.nasa.gov/ems/01_intro
  16. http://newt.phys.unsw.edu.au/jw/sound.spectrum.html
  17. https://apod.nasa.gov/apod/ap130408.html
  18. https://apod.nasa.gov/apod/ap200726.html
  19. https://chandra.harvard.edu/photo/cosmic_distance.html
  20. https://en.wikipedia.org/wiki/Piano_key_frequencies
  21. https://asterisk.apod.com/discuss_apod.php?date=250302
  22. https://apod.nasa.gov/apod/ap250301.html
  23. https://apod.nasa.gov/apod/archivepix.html
  24. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  25. https://apod.nasa.gov/apod/lib/aptree.html
  26. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  27. https://apod.nasa.gov/apod/calendar/allyears.html
  28. https://apod.com/feed.rss
  29. https://apod.nasa.gov/apod/lib/edlinks.html
  30. https://apod.nasa.gov/apod/lib/about_apod.html
  31. https://asterisk.apod.com/discuss_apod.php?date=250302
  32. https://apod.nasa.gov/apod/ap250303.html
  33. http://www.phy.mtu.edu/faculty/Nemiroff.html
  34. http://www.phy.mtu.edu/
  35. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  36. http://www.astro.umd.edu/
  37. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  38. https://www.nasa.gov/about/highlights/HP_Privacy.html
  39. https://www.nasa.gov/general/accessibility/
  40. https://www.nasa.gov/privacy/
  41. https://astrophysics.gsfc.nasa.gov/
  42. https://www.nasa.gov/
  43. https://www.nasa.gov/centers/goddard/
  44. https://science.nasa.gov/learners
  45. http://www.mtu.edu/