APOD: 2019 April 16 - In the Vicinity of the Cone Nebula

                         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 April 16
                                      [2]
                      In the Vicinity of the Cone Nebula
  Image Credit: Chilescope [3] ; Processing & Copyright: Utkarsh Mishra [4]

Explanation: Strange shapes and textures can be found in neighborhood of the
Cone Nebula [5] . The unusual shapes [6] originate from fine interstellar dust
[7]  reacting in complex ways with the energetic light and hot gas being
expelled by the young stars. The brightest star on the right of the featured
picture [8]  is S Mon [9] , while the region just below it has been nicknamed
the Fox Fur Nebula [10]  for its color and structure. The blue glow [11]
directly surrounding S Mon [12]  results from reflection [13] , where
neighboring dust reflects light from the bright star. The red glow [14] that
encompasses the whole region results not only from dust reflection but also
emission [15]  from hydrogen [16]  gas ionized [17]  by starlight. S Mon [18]
is part of a young open cluster of stars [19]  named NGC 2264 [20] , located
about 2500 light years [21] away toward the constellation [22]  of the Unicorn
( Monoceros [23] ). Even though it points right at S Mon, details of the
origin of the mysterious geometric Cone Nebula [24] , visible on the far left,
remain a mystery [25] .

                      Tomorrow's picture: open space [26]

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Site notes:
  [1] archivepix.html
  [2] image/1904/ConeFoxfur_Mishra_1687.jpg
  [3] http://www.chilescope.com/about/chilescope/
  [4] https://www.flickr.com/photos/163350986@N06/
  [5] ap170315.html
  [6] ap081228.html
  [7] ap990509.html
  [8] https://www.flickr.com/photos/163350986@N06/3...
  [9] https://en.wikipedia.org/wiki/S_Monocerotis
  [10] ap080422.html
  [11] http://www.youtube.com/watch?v=KZVvIWI2psU
  [12] http://stars.astro.illinois.edu/sow/15mon.htm...
  [13] reflection_nebulae.html
  [14] ap111106.html
  [15] http://en.wikipedia.org/wiki/Emission_nebula
  [16] ap010113.html
  [17] https://en.wikipedia.org/wiki/Ionization
  [18] http://en.wikipedia.org/wiki/S_Monocerotis
  [19] http://asterisk.apod.com/viewtopic.php?f=24&t...
  [20] http://adsabs.harvard.edu/abs/2002AAS...200.7...
  [21] https://spaceplace.nasa.gov/light-year/en/
  [22]
http://www.astro.wisc.edu/~dolan/constellatio...
  [23] http://www.hawastsoc.org/deepsky/mon/index.ht...
  [24] ap020107.html
  [25]
http://www.grassrootsinternetstrategy.com.au/...
cute-dog.jpg
  [26] ap190417.html
  [27] ap190415.html
  [28] archivepix.html
  [29] lib/apsubmit2015.html
  [30] lib/aptree.html
  [31] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [32] calendar/allyears.html
  [33] /apod.rss
  [34] lib/edlinks.html
  [35] lib/about_apod.html
  [36] http://asterisk.apod.com/discuss_apod.php?dat...
  [37] ap190417.html
  [38] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [39] http://www.phy.mtu.edu/
  [40] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [41] http://www.astro.umd.edu/
  [42] lib/about_apod.html#srapply
  [43] https://www.nasa.gov/about/highlights/HP_Priv...
  [44] https://astrophysics.gsfc.nasa.gov/
  [45] https://www.nasa.gov/
  [46] https://www.nasa.gov/centers/goddard/
  [47] http://www.mtu.edu/

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