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 September 16
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                          A Lunar Corona over Turin
     Image Credit & Copyright: [3]Giorgia Hofer ([4]Cortina Astronomical
                                Association)

   Explanation: What are those colorful rings around the Moon? A
   [5]corona. Rings like this will sometimes appear when the Moon is seen
   through thin clouds. The [6]effect is created by the quantum mechanical
   [7]diffraction of light around individual, similarly-sized water
   droplets in an [8]intervening but mostly-transparent cloud. Since light
   of different colors has [9]different wavelengths, each color
   [10]diffracts differently. [11]Lunar Coronae are one of the few
   [12]quantum mechanical color effects that can be [13]easily seen with
   the unaided eye. The [14]featured lunar corona was captured around
   [15]full Moon above [16]Turin, [17]Italy in 2014. [18]Similar coronae
   that form [19]around the Sun are usually harder to see because of the
   Sun's [20]great brightness.

                  Tomorrow's picture: exoplanet water vapor
     __________________________________________________________________

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    Authors & editors: [32]Robert Nemiroff ([33]MTU) & [34]Jerry Bonnell
                                 ([35]UMCP)
          NASA Official: Phillip Newman [36]Specific rights apply.
              [37]NASA Web Privacy Policy and Important Notices
                A service of: [38]ASD at [39]NASA / [40]GSFC
                           & [41]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1909/LunarCorona_Hofer_3264.jpg
   3. https://www.giorgiahoferphotography.com/
   4. https://www.cortinastelle.eu/
   5. https://www.atoptics.co.uk/droplets/corona.htm
   6. https://www.atoptics.co.uk/droplets/corform.htm
   7. https://en.wikipedia.org/wiki/Diffraction
   8. https://www.youtube.com/watch?v=fgiOjqTiwn8
   9. https://science.nasa.gov/ems/01_intro
  10. https://www.exploratorium.edu/snacks/diffraction
  11. https://en.wikipedia.org/wiki/Corona_(optical_phenomenon)
  12. https://asterisk.apod.com/viewtopic.php?f=39&t=21334
  13. http://physics.stackexchange.com/questions/65397/quantum-mechanics-and-everyday-nature
  14. https://www.giorgiahoferphotography.com/moon?lightbox=image_984
  15. https://apod.nasa.gov/apod/ap190913.html
  16. https://www.youtube.com/watch?v=5KIl4bpaDBM
  17. https://en.wikipedia.org/wiki/Italy
  18. http://epod.usra.edu/blog/2014/02/coronas-around-the-moon.html
  19. https://apod.nasa.gov/apod/ap160111.html
  20. https://i.ebayimg.com/images/g/qYIAAOSwZkJUUUTX/s-l300.jpg
  21. https://apod.nasa.gov/apod/ap190915.html
  22. https://apod.nasa.gov/apod/archivepix.html
  23. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  24. https://apod.nasa.gov/apod/lib/aptree.html
  25. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  26. https://apod.nasa.gov/apod/calendar/allyears.html
  27. https://apod.nasa.gov/apod.rss
  28. https://apod.nasa.gov/apod/lib/edlinks.html
  29. https://apod.nasa.gov/apod/lib/about_apod.html
  30. http://asterisk.apod.com/discuss_apod.php?date=190916
  31. https://apod.nasa.gov/apod/ap190917.html
  32. http://www.phy.mtu.edu/faculty/Nemiroff.html
  33. http://www.phy.mtu.edu/
  34. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  35. http://www.astro.umd.edu/
  36. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  37. https://www.nasa.gov/about/highlights/HP_Privacy.html
  38. https://astrophysics.gsfc.nasa.gov/
  39. https://www.nasa.gov/
  40. https://www.nasa.gov/centers/goddard/
  41. http://www.mtu.edu/