                         Astronomy Picture of the Day

                         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.

                                2018 November 7
                                      [2]
                        NGC 6188: The Dragons of Ara
                  Image Credit & Copyright [3] : Tian Lee [4]

Explanation: Dark shapes with bright edges winging their way through dusty NGC
6188 are tens of light-years long. The emission nebula [5]  is found near the
edge of an otherwise dark large molecular cloud in the southern constellation
Ara [6] , about 4,000 light-years away. Born in [7] that region only a few
million years ago, the massive young stars of [8]  the embedded Ara OB1
association [9] sculpt the fantastic shapes and power the nebular glow with
stellar winds and intense ultraviolet radiation. The recent star formation
[10]  itself was likely triggered by winds and supernova explosions, from
previous generations of massive stars, that swept up and compressed the
molecular gas. With image data from the Chilescope Observatory [11] , a
false-color Hubble palette [12] was used to create this gorgeous wide-field
image and shows emission from sulfur, hydrogen, and oxygen atoms in red,
green, and blue hues. The field of view spans about four full Moons,
corresponding to about 150 light years at the estimated distance of NGC 6188.
[13]

                     Tomorrow's picture: Mars in the Loop

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Site notes:
  [1] archivepix.html
  [2] image/1811/ngc6188TianLee.jpg
  [3] lib/about_apod.html#srapply
  [4] mailto: 201611160113[at]mail[dot]bnu[dot]edu[dot]cn
  [5] http://fusedweb.llnl.gov/CPEP/Chart_Pages/5.Plasmas/Nebula/ Emission.html
  [6] http://en.wikipedia.org/wiki/Ara_(constellation)
  [7] https://jwst.nasa.gov/birth.html
  [8] http://arxiv.org/abs/1105.3629
  [9] http://en.wikipedia.org/wiki/ Stellar_association#OB_associations
  [10] http://archive.ncsa.uiuc.edu/Cyberia/Bima/StarForm.html
  [11] http://www.chilescope.com/image-gallery/29/
  [12] http://hubble.stsci.edu/gallery/
behind_the_pictures/meaning_of_color/eagle.php
  [13] https://en.wikipedia.org/wiki/NGC_6188
  [14] ap181106.html
  [15] archivepix.html
  [16] lib/apsubmit2015.html
  [17] lib/aptree.html
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  [23] http://asterisk.apod.com/discuss_apod.php?date=181107
  [24] ap181108.html
  [25] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [26] http://www.phy.mtu.edu/
  [27] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
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  [29] lib/about_apod.html#srapply
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