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 July 26
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                             The Veins of Heaven
      Image Credit & [3]Copyright: P-M Hedén ([4]Clear Skies, [5]TWAN)

   Explanation: [6]Transfusing sunlight through a still dark sky, this
   exceptional display of [7]noctilucent clouds was captured earlier this
   month, reflected in the calm waters of Vallentuna Lake near Stockholm,
   Sweden. From the edge of space, about 80 kilometers above Earth's
   surface, the [8]icy clouds themselves still reflect sunlight even
   though the Sun is below the horizon as seen from the ground. [9]Usually
   spotted at high latitudes in summer months the night shining clouds
   have made a strong showing so far during the short northern [10]summer
   nights. Also known as polar mesopheric clouds they [11]are understood
   to form as water vapor driven into the cold upper atmosphere condenses
   on the fine dust particles supplied by disintegrating meteors or
   volcanic ash. NASA's AIM mission provides daily projections of
   noctilucent clouds [12]as seen from space.

                  Tomorrow's picture: launch and last light
     __________________________________________________________________

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    Authors & editors: [24]Robert Nemiroff ([25]MTU) & [26]Jerry Bonnell
                                 ([27]UMCP)
          NASA Official: Phillip Newman [28]Specific rights apply.
              [29]NASA Web Privacy Policy and Important Notices
                A service of: [30]ASD at [31]NASA / [32]GSFC
                           & [33]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1907/NLCReflectionsAPODheden.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. http://www.clearskies.se/
   5. http://www.twanight.org/
   6. http://vimeo.com/101077253
   7. http://www.twanight.org/newTWAN/results.asp?keyword=nlc
   8. http://www.atoptics.co.uk/highsky/nlc1.htm
   9. http://earthobservatory.nasa.gov/IOTD/view.php?id=48892
  10. https://apod.nasa.gov/apod/ap190628.html
  11. http://science.nasa.gov/science-news/science-at-nasa/2013/23dec_antarctica/
  12. http://www.nasa.gov/mission_pages/aim/index.html
  13. https://apod.nasa.gov/apod/ap190725.html
  14. https://apod.nasa.gov/apod/archivepix.html
  15. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  16. https://apod.nasa.gov/apod/lib/aptree.html
  17. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  18. https://apod.nasa.gov/apod/calendar/allyears.html
  19. https://apod.nasa.gov/apod.rss
  20. https://apod.nasa.gov/apod/lib/edlinks.html
  21. https://apod.nasa.gov/apod/lib/about_apod.html
  22. http://asterisk.apod.com/discuss_apod.php?date=190726
  23. https://apod.nasa.gov/apod/ap190727.html
  24. http://www.phy.mtu.edu/faculty/Nemiroff.html
  25. http://www.phy.mtu.edu/
  26. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  27. http://www.astro.umd.edu/
  28. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  29. https://www.nasa.gov/about/highlights/HP_Privacy.html
  30. https://astrophysics.gsfc.nasa.gov/
  31. https://www.nasa.gov/
  32. https://www.nasa.gov/centers/goddard/
  33. http://www.mtu.edu/