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.

                              2024 November 19
      [2]A series of white parallel clouds are seen going off into the
   distance in a background blue sky. In the foreground is a hill with two
       domes at the top. Please see the explanation for more detailed
                                information.

               Undulatus Clouds over Las Campanas Observatory
      Image Credit & [3]Copyright: [4]Yuri Beletsky ([5]Carnegie [6]Las
             Campanas Observatory, [7]TWAN); h/t: [8]Alice Allen

   Explanation: What's happening with these clouds? While it may seem that
   these [9]long and thin clouds are pointing toward the top of a hill,
   and that maybe a [10]world-famous observatory is located there, only
   part of that is true. In terms of [11]clouds, the formation is a chance
   superposition of impressively [12]periodic undulating air currents in
   [13]Earth's lower atmosphere. [14]Undulatus, a type of
   [15]Asper[16]it[17]as cloud, form at the peaks where the air is cool
   enough to [18]cause the condensation of opaque water droplets. The
   [19]wide-angle nature of the panorama creates the illusion that the
   clouds converge over the hill. In terms of land, there really is a
   world-famous observatory at the top of that peak: the [20]Carnegie
   Science's [21]Las Campanas [22]Observatory in the [23]Atacama Desert of
   [24]Chile. The two telescope [25]domes visible are the 6.5-meter
   [26]Magellan Telescopes. The featured coincidental vista was a
   [27]surprise but was captured by the phone of a quick-thinking
   photographer in late September.

   Your Sky Surprise: [28]What picture did APOD feature on your birthday?
                                 (post 1995)
                      Tomorrow's picture: flight day 6
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    Authors & editors: [40]Robert Nemiroff ([41]MTU) & [42]Jerry Bonnell
                                 ([43]UMCP)
          NASA Official: Amber Straughn [44]Specific rights apply.
            [45]NASA Web Privacy, [46]Accessibility, [47]Notices;
                A service of: [48]ASD at [49]NASA / [50]GSFC,
                         [51]NASA Science Activation
                           & [52]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2411/ParallelClouds_Beletsky_1400.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.instagram.com/yuribeletsky/
   5. http://carnegiescience.edu/
   6. http://www.lco.cl/
   7. https://twanight.org/about/
   8. https://en.wikipedia.org/wiki/Alice_Allen_(astronomer)
   9. https://apod.nasa.gov/apod/ap130602.html
  10. https://en.wikipedia.org/wiki/List_of_astronomical_observatories
  11. https://gpm.nasa.gov/education/videos/nasa-our-world-what-cloud
  12. https://en.wikipedia.org/wiki/Periodic_function
  13. https://www.nasa.gov/general/what-is-earths-atmosphere/
  14. https://cloudappreciationsociety.org/cloud-library/undulatus/
  15. https://en.wikipedia.org/wiki/Asperitas_(cloud)
  16. https://apod.nasa.gov/apod/ap180819.html
  17. https://en.wikipedia.org/wiki/Asperitas_(cloud)
  18. https://climatekids.nasa.gov/cloud-formation/
  19. https://apod.nasa.gov/apod/ap230702.html
  20. https://carnegiescience.edu/
  21. https://www.lco.cl/
  22. https://youtu.be/99US2V3xuLw
  23. https://youtu.be/o5JfmFSBDgE
  24. https://en.wikipedia.org/wiki/Chile
  25. https://apod.nasa.gov/apod/ap240127.html
  26. https://en.wikipedia.org/wiki/Magellan_Telescopes
  27. https://www.reddit.com/media?url=https://i.redd.it/2oy3au68a8511.jpg
  28. https://apod.nasa.gov/apod/calendar/allyears.html
  29. https://apod.nasa.gov/apod/ap241118.html
  30. https://apod.nasa.gov/apod/archivepix.html
  31. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  32. https://apod.nasa.gov/apod/lib/aptree.html
  33. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  34. https://apod.nasa.gov/apod/calendar/allyears.html
  35. https://apod.com/feed.rss
  36. https://apod.nasa.gov/apod/lib/edlinks.html
  37. https://apod.nasa.gov/apod/lib/about_apod.html
  38. https://asterisk.apod.com/discuss_apod.php?date=241119
  39. https://apod.nasa.gov/apod/ap241120.html
  40. http://www.phy.mtu.edu/faculty/Nemiroff.html
  41. http://www.phy.mtu.edu/
  42. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  43. http://www.astro.umd.edu/
  44. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  45. https://www.nasa.gov/about/highlights/HP_Privacy.html
  46. https://www.nasa.gov/general/accessibility/
  47. https://www.nasa.gov/privacy/
  48. https://astrophysics.gsfc.nasa.gov/
  49. https://www.nasa.gov/
  50. https://www.nasa.gov/centers/goddard/
  51. https://science.nasa.gov/learners
  52. http://www.mtu.edu/