APOD: 2019 May 21 - Deep Field: Nebulae of Sagittarius

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                                  2019 May 21
                                      [2]
                      Deep Field: Nebulae of Sagittarius
              Image Credit & Copyright: Emilio Rivero Padilla [3]

Explanation: These three bright nebulae are often featured on telescopic tours
of the constellation Sagittarius [4]  and the crowded starfields of the
central Milky Way [5] . In fact, 18th century cosmic tourist Charles Messier
[6]  cataloged two of them; M8 [7] , the large nebula just left of center, and
colorful M20 [8]  on the top left. The third emission region includes NGC 6559
[9] and can be found to the right of M8. All three are stellar nurseries [10]
about five thousand light-years or so distant. Over a hundred light-years [11]
 across, the expansive M8 is also known as the Lagoon Nebula [12] . M20's
popular moniker is the Trifid [13] . Glowing hydrogen gas creates the dominant
red color of the emission nebulae [14] . In striking contrast, blue hues in
the Trifid are due to dust reflected starlight [15] . Recently formed bright
blue stars are visible nearby. The colorful composite skyscape was recorded in
2018 in Teide National Park [16]  in the Canary Islands [17] , Spain [18] .

                    Tomorrow's picture: farthest world [19]

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Site notes:
  [1] archivepix.html
  [2] image/1905/M8M20_Padilla_1534.jpg
  [3] http://astrosurf.com/emilio/
  [4] http://www.hawastsoc.org/deepsky/sgr/ index.html
  [5] ap161110.html
  [6] http://messier.seds.org/xtra/history/biograph.html
  [7] ap160909.html
  [8] ap170628.html
  [9] ap040629.html
  [10] ap121211.html
  [11]
https://www.grc.nasa.gov/WWW/k-12/Numbers/Math/Mathematical_Thinking/
how_long_is_a_light_year.htm
  [12] https://en.wikipedia.org/wiki/Lagoon_Nebula
  [13] https://en.wikipedia.org/wiki/Trifid_Nebula
  [14] ap180327.html
  [15] ap011228.html
  [16] https://www.youtube.com/watch?v=-5juqIAf0ik
  [17] https://en.wikipedia.org/wiki/Canary_Islands
  [18] https://en.wikipedia.org/wiki/Spain
  [19] ap190522.html
  [20] ap190520.html
  [21] archivepix.html
  [22] lib/apsubmit2015.html
  [23] lib/aptree.html
  [24] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [25] calendar/allyears.html
  [26] /apod.rss
  [27] lib/edlinks.html
  [28] lib/about_apod.html
  [29] http://asterisk.apod.com/discuss_apod.php?date=190521
  [30] ap190522.html
  [31] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [32] http://www.phy.mtu.edu/
  [33] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [34] http://www.astro.umd.edu/
  [35] lib/about_apod.html#srapply
  [36] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [37] https://astrophysics.gsfc.nasa.gov/
  [38] https://www.nasa.gov/
  [39] https://www.nasa.gov/centers/goddard/
  [40] http://www.mtu.edu/

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