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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 December 9

         IFRAME: [2]https://www.youtube.com/embed/Eenw0p14ZrM?rel=0

                         Arecibo Telescope Collapse
                Video Credit: [3]Arecibo Observatory, [4]NSF

   Explanation: This was one great scientific instrument. Starting in
   1963, the 305-meters across [5]Arecibo Telescope in [6]Puerto Rico
   [7]USA reigned as the [8]largest [9]single-dish [10]radio telescope in
   [11]the world for over 50 years. Among [12]numerous firsts and
   milestones, data from [13]Arecibo has been used to measure the [14]spin
   of Mercury, [15]map the surface of Venus, discover the [16]first
   planets outside of our Solar System, [17]verify the existence of
   gravitational radiation, [18]search for extraterrestrial intelligence,
   and, reportedly, [19]locate hidden military radar by tracking their
   reflections from the Moon. Past its prime and in the process of being
   [20]decommissioned, the [21]Arecibo Telescope suffered a catastrophic
   structural [22]collapse early this month, as seen in the [23]featured
   composite [24]video.

                       Tomorrow's picture: open space
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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://www.youtube.com/embed/Eenw0p14ZrM?rel=0
   3. http://www.naic.edu/
   4. https://nsf.gov/
   5. http://www.naic.edu/ao/
   6. https://en.wikipedia.org/wiki/Puerto_Rico
   7. https://www.cia.gov/library/publications/the-world-factbook/geos/us.html
   8. https://apod.nasa.gov/apod/ap981129.html
   9. https://youtu.be/M1T9ZbytyFo
  10. https://www.radio2space.com/largest-radio-telescopes-in-the-world/
  11. https://en.wikipedia.org/wiki/Five-hundred-meter_Aperture_Spherical_Telescope
  12. https://www.sciencenews.org/article/arecibo-telescope-collapse-astronomy-discoveries
  13. http://www.naic.edu/
  14. https://apod.nasa.gov/apod/ap190428.html
  15. https://apod.nasa.gov/apod/ap010515.html
  16. https://www.questia.com/magazine/1G1-11824831/radio-pulses-hint-at-unseen-planets
  17. https://www.nobelprize.org/prizes/physics/1993/press-release/
  18. https://www.seti.org/seti-institute/project/details/early-seti-project-ozma-arecibo-message
  19. https://www.thedrive.com/the-war-zone/37898/collapsed-arecibo-radio-telescope-was-first-built-for-ballistic-missile-defense-research
  20. https://www.nasa.gov/feature/nasa-statement-on-nsf-s-planned-controlled-decommissioning-of-arecibo-radio-telescope
  21. https://www.nsf.gov/news/special_reports/arecibo/
  22. https://www.syfy.com/syfywire/footage-arecibo-observatory-telescope-collapse
  23. https://commons.wikimedia.org/wiki/File:Collapse_of_Arecibo_Radio_Telescope_01.webm
  24. https://commons.wikimedia.org/wiki/File:Arecibo-collapse-drone.webm
  25. https://apod.nasa.gov/apod/ap201208.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=201209
  35. https://apod.nasa.gov/apod/ap201210.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/