Subj : Daily APOD Report To : All From : Ben Ritchey Date : Thu May 23 2019 13:10:21 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] ------------------------------------------------------------------------------- < [20] | Archive [21] | Submissions [22] | Index [23] | Search [24] | Calendar [25] | RSS [26] | Education [27] | About APOD [28] | Discuss [29] | > [30] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [31] (MTU [32] ) & Jerry Bonnell [33] (UMCP [34] ) NASA Official: Phillip Newman Specific rights apply [35] . NASA Web Privacy Policy and Important Notices [36] A service of: ASD [37] at NASA [38] / GSFC [39] & Michigan Tech. U. [40] ---------- 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/ --- Mystic BBS v1.12 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .