          APOD: 2017 October 18 - Stars and Dust in Corona Australis

                         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.

                                2017 October 18
                                      [2]
                      Stars and Dust in Corona Australis
          Image Credit & Copyright: Eric Coles [3]  & Martin Pugh [4]

Explanation: Blue dust clouds and young, energetic stars inhabit this
telescopic vista, less than 500 light-years away toward the northern boundary
of Corona Australis [5] , the Southern Crown. The dust clouds effectively
block light [6]  from more distant background stars [7]  in the Milky Way [8]
. But the striking complex of reflection nebulas [9]  cataloged as NGC 6726,
6727, and IC 4812 produce a characteristic blue color as light from the
region's bright blue stars is reflected by [10]  the cosmic dust. The dust
also obscures [11]  from view stars still in the process [12] of formation. At
the left, smaller yellowish nebula NGC 6729 bends around [13]  young variable
star R Coronae Australis [14] . Just below it, glowing arcs [15]  and loops
[16]  shocked by outflows from embedded newborn stars are identified as
Herbig-Haro objects [17] . On the sky this field of view spans about one
degree, corresponding to almost nine light-years [18]  at the estimated
distance of the nearby star forming region.

              Explore the Universe: Random APOD Generator [19]
                   Tomorrow's picture: whirling galaxy [20]

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Site notes:
  [1] archivepix.html
  [2] image/1710/NGC6726_ColesPugh_960.jpg
  [3] http://www.astrobin.com/users/coles44/
  [4] https://www.martinpughastrophotography.space/
  [5] http://www.botproductions.com/stellar/ corona_australis.html
  [6] ap090425.html
  [7]
https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve
  [8] http://members.nova.org/~sol/chview/chv5.htm
  [9] reflection_nebulae.html
  [10] ap011228.html
  [11] ap031226.html
  [12] http://arxiv.org/abs/1211.6945
  [13]
http://www.lifewithdogs.tv/wp-content/uploads/2014/06/
6.4.14-Dogs-and-Cats-Who-Love-to-Cuddle7.jpg
  [14] http://www.solstation.com/stars/r-coraus.htm
  [15] ap991129.html
  [16] ap140126.html
  [17] ap151218.html
  [18] https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html
  [19] https://apod.nasa.gov/apod/random_apod.html
  [20] ap171019.html
  [21] ap171017.html
  [22] archivepix.html
  [23] lib/apsubmit2015.html
  [24] lib/aptree.html
  [25] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [26] calendar/allyears.html
  [27] /apod.rss
  [28] lib/edlinks.html
  [29] lib/about_apod.html
  [30] http://asterisk.apod.com/discuss_apod.php?date=171018
  [31] ap171019.html
  [32] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [33] http://www.phy.mtu.edu/
  [34] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [35] http://www.astro.umd.edu/
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