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.

                               2019 August 19
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                      Lenticular Clouds over Mount Etna
                Image Credit & Copyright: [3]Dario Giannobile

   Explanation: What's happening above that volcano? Although [4]Mount
   Etna is seen erupting, the clouds are not related to the [5]eruption.
   They are [6]lenticular clouds formed when moist air is forced upwards
   near a mountain or [7]volcano. The surreal scene was captured by chance
   late last month when the astrophotographer went to Mount Etna, a
   [8]UNESCO [9]World Heritage Site in [10]Sicily, [11]Italy, to
   photograph the conjunction between the Moon and the star [12]Aldebaran.
   The Moon appears in a bright [13]crescent phase, illuminating an edge
   of the lower lenticular cloud. Red hot [14]lava flows on the right.
   Besides some breathtaking stills, a companion [15]time-lapse video of
   the scene shows the [16]lenticular clouds forming and wavering as
   [17]stars trail far in the distance.

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                    Tomorrow's picture: black hole spiral
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    Authors & editors: [33]Robert Nemiroff ([34]MTU) & [35]Jerry Bonnell
                                 ([36]UMCP)
          NASA Official: Phillip Newman [37]Specific rights apply.
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                A service of: [39]ASD at [40]NASA / [41]GSFC
                           & [42]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1908/EtnaCloudsMoon_Giannobile_1600.jpg
   3. https://www.dariogiannobile.com/blog
   4. https://en.wikipedia.org/wiki/Mount_Etna
   5. https://apod.nasa.gov/apod/ap170426.html
   6. https://apod.nasa.gov/apod/ap121104.html
   7. https://www.youtube.com/watch?v=rznju2ivzfU
   8. https://en.wikipedia.org/wiki/UNESCO
   9. https://en.wikipedia.org/wiki/World_Heritage_Site
  10. https://en.wikipedia.org/wiki/Sicily
  11. https://en.wikipedia.org/wiki/Italy
  12. http://stars.astro.illinois.edu/sow/aldebaran.html
  13. https://apod.nasa.gov/apod/ap130414.html
  14. https://apod.nasa.gov/apod/ap120402.html
  15. https://youtu.be/04_OOLoJUdU
  16. https://www.weather.gov/abq/features_acsl
  17. https://www.lightstalking.com/how-to-photograph-star-trails/
  18. https://www.instagram.com/astronomypicturesdaily/
  19. https://www.facebook.com/AstronomyPictureOfTheDay
  20. https://www.reddit.com/r/apod
  21. https://twitter.com/apod/
  22. https://apod.nasa.gov/apod/ap190818.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.nasa.gov/apod.rss
  29. https://apod.nasa.gov/apod/lib/edlinks.html
  30. https://apod.nasa.gov/apod/lib/about_apod.html
  31. http://asterisk.apod.com/discuss_apod.php?date=190819
  32. https://apod.nasa.gov/apod/ap190820.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://astrophysics.gsfc.nasa.gov/
  40. https://www.nasa.gov/
  41. https://www.nasa.gov/centers/goddard/
  42. http://www.mtu.edu/