APOD: 2019 March 18 - Horsehead and Orion Nebulas

                         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 March 18
                                      [2]
                         Horsehead and Orion Nebulas
                  Image Credit & Copyright: Mario Zauner [3]

Explanation: The dark Horsehead Nebula [4]  and the glowing Orion Nebula [5]
are contrasting cosmic vistas. Adrift 1,500 light-years [6] away in one of the
night sky's [7] most recognizable constellations [8] , they appear in opposite
corners of the above stunning two-panel mosaic [9] . The familiar Horsehead
[10] nebula appears as a dark cloud on the lower left, a small silhouette [11]
notched against the glow of hydrogen (alpha [12] ) gas, here tinted orange.
Alnitak [13]  is the easternmost star in Orion's belt [14]  and can be found
to the left of the Horsehead [15] . Below Alnitak is the Flame Nebula [16] ,
with clouds of bright emission and dramatic [17]  dark dust lanes. The
magnificent emission region, the Orion Nebula [18]  (aka M42), lies at the
upper right, surrounded by the blue glow of reflecting dust. Immediately to
its left is a prominent reflection nebula [19]  sometimes called the Running
Man. Pervasive tendrils [20] of glowing hydrogen gas are easily traced [21]
throughout the region.

                  Tomorrow's picture: galaxy stretchers [22]

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Site notes:
  [1] archivepix.html
  [2] image/1903/Horsehead2Nebula_Zauner_14173.jpg
  [3] https://www.astrobin.com/users/MarioZauner/
  [4] ap171227.html
  [5] ap171129.html
  [6] https://spaceplace.nasa.gov/light-year/en/
  [7] ap030207.html
  [8] http://en.wikipedia.org/wiki/Constellation
  [9] https://www.astrobin.com/391962/0/?nc=user
  [10] http://en.wikipedia.org/wiki/Horsehead_Nebula
  [11] ap171203.html
  [12] https://en.wikipedia.org/wiki/H-alpha
  [13] http://www.gb.nrao.edu/~rmaddale/Education/Or... belt.html
  [14] ap090210.html
  [15] http://drawsketch.about.com/library/bl-step-h...
  [16] ap141209.html
  [17] ap090929.html
  [18] http://en.wikipedia.org/wiki/Orion_nebula
  [19] http://antwrp.gsfc.nasa.gov/apod/reflection_n...
  [20] ap090224.html
  [21] http://www.youtube.com/watch?v=NWNWaWUxS5g
  [22] ap190319.html
  [23] ap190317.html
  [24] archivepix.html
  [25] lib/apsubmit2015.html
  [26] lib/aptree.html
  [27] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [28] calendar/allyears.html
  [29] /apod.rss
  [30] lib/edlinks.html
  [31] lib/about_apod.html
  [32] http://asterisk.apod.com/discuss_apod.php?dat...
  [33] ap190319.html
  [34] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [35] http://www.phy.mtu.edu/
  [36] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [37] http://www.astro.umd.edu/
  [38] lib/about_apod.html#srapply
  [39] https://www.nasa.gov/about/highlights/HP_Priv...
  [40] https://astrophysics.gsfc.nasa.gov/
  [41] https://www.nasa.gov/
  [42] https://www.nasa.gov/centers/goddard/
  [43] http://www.mtu.edu/

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