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                        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.

                              2020 September 20
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                           Breaking Distant Light
                   Image Credit: [3]VIMOS, [4]VLT, [5]ESO

   Explanation: In the distant universe, [6]time appears to run slowly.
   Since [7]time-dilated light appears shifted toward the red end of the
   [8]spectrum ([9]redshifted), astronomers are able to use
   [10]cosmological time-slowing to help measure vast [11]distances in the
   universe. [12]Featured, the light from [13]distant galaxies has been
   broken up into its constituent colors ([14]spectra), allowing
   astronomers to measure the [15]cosmological redshift of known
   [16]spectral lines. The novelty of the [17]featured image is that the
   [18]distance to hundreds of galaxies can be measured from a single
   frame, in this case one taken by the [19]Visible MultiObject
   Spectrograph (VIMOS) operating at the [20]Very Large Telescope (VLT)
   array in [21]Chile. Analyzing the space distribution of [22]distant
   objects will allow insight into when and how stars and galaxies formed,
   clustered, and [23]evolved in the early [24]universe.

                    Tomorrow's picture: omega sun sailing
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    Authors & editors: [36]Robert Nemiroff ([37]MTU) & [38]Jerry Bonnell
                                 ([39]UMCP)
          NASA Official: Phillip Newman [40]Specific rights apply.
              [41]NASA Web Privacy Policy and Important Notices
                A service of: [42]ASD at [43]NASA / [44]GSFC
                           & [45]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2009/DistantSpectra_ESO_960.jpg
   3. https://www.eso.org/sci/facilities/paranal/decommissioned/vimos.html
   4. https://www.eso.org/projects/vlt/
   5. https://www.eso.org/
   6. https://www.nist.gov/pml/time-and-frequency-division/popular-links/walk-through-time
   7. http://www.fourmilab.ch/cship/timedial.html
   8. https://science.nasa.gov/ems/01_intro
   9. https://apod.nasa.gov/apod/ap130408.html
  10. https://en.wikipedia.org/wiki/Time#Time_dilation
  11. http://antwrp.gsfc.nasa.gov/debate/debate96.html
  12. https://www.eso.org/public/images/eso0209b/
  13. https://apod.nasa.gov/apod/ap140605.html
  14. https://imagine.gsfc.nasa.gov/features/yba/M31_velocity/spectrum/doppler_galaxies.html
  15. https://astronomy.swin.edu.au/cosmos/c/cosmological+redshift
  16. https://astrobites.org/guides/spectroscopy-and-spectral-lines/
  17. https://www.eso.org/public/images/eso0209b/
  18. https://apod.nasa.gov/apod/ap010904.html
  19. http://www.eso.org/sci/facilities/paranal/decommissioned/vimos.html
  20. https://apod.nasa.gov/apod/ap000707.html
  21. https://en.wikipedia.org/wiki/Chile
  22. https://apod.nasa.gov/apod/ap020117.html
  23. https://apod.nasa.gov/apod/ap990905.html
  24. https://ui.adsabs.harvard.edu/abs/2008AmJPh..76..265N/abstract
  25. https://apod.nasa.gov/apod/ap200919.html
  26. https://apod.nasa.gov/apod/archivepix.html
  27. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  28. https://apod.nasa.gov/apod/lib/aptree.html
  29. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  30. https://apod.nasa.gov/apod/calendar/allyears.html
  31. https://apod.nasa.gov/apod.rss
  32. https://apod.nasa.gov/apod/lib/edlinks.html
  33. https://apod.nasa.gov/apod/lib/about_apod.html
  34. http://asterisk.apod.com/discuss_apod.php?date=200920
  35. https://apod.nasa.gov/apod/ap200921.html
  36. http://www.phy.mtu.edu/faculty/Nemiroff.html
  37. http://www.phy.mtu.edu/
  38. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  39. http://www.astro.umd.edu/
  40. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  41. https://www.nasa.gov/about/highlights/HP_Privacy.html
  42. https://astrophysics.gsfc.nasa.gov/
  43. https://www.nasa.gov/
  44. https://www.nasa.gov/centers/goddard/
  45. http://www.mtu.edu/