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 September 20
                                      [2]
                      Stars and Dust in Corona Australis
                Image Credit & Copyright [3] : Josep Drudis [4]

Explanation: Cosmic dust clouds and young, energetic stars inhabit this
telescopic vista [5] , less than 500 light-years away toward the northern
boundary of Corona Australis [6] , the Southern Crown. The dust clouds
effectively block light [7]  from more distant background stars in the Milky
Way [8] . But the striking complex of reflection nebulae cataloged as NGC
6726, 6727, and IC 4812 [9]  produce a characteristic color as blue light from
the region's young, hot stars is reflected by [10]  the cosmic dust. The dust
also obscures [11]  from view stars still in the process [12] of formation. At
top right, smaller yellowish nebula NGC 6729 bends around young variable star
R Coronae Australis [13] . Near it, glowing arcs and loops shocked by outflows
[14]  from embedded newborn stars are identified as Herbig-Haro objects [15] .
On the sky this field of view spans about 1 degree. That corresponds to almost
9 light-years at the estimated distance of the nearby star forming region.

                     Tomorrow's picture: irregular galaxy

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    Authors & editors: Robert Nemiroff [27] (MTU [28] ) & Jerry Bonnell [29]
                                  (UMCP [30] )
          NASA Official:  Phillip Newman Specific rights apply [31] .
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              A service of: ASD [33]  at NASA [34]  / GSFC [35]
                           & Michigan Tech. U. [36]
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Site notes:
  [1] archivepix.html
  [2] image/1809/NGC6727-drudis.jpg
  [3] lib/about_apod.html#srapply
  [4] http://www.astrodrudis.com/
  [5] https://astrodrudis.com/ngc-6726-ngc-6727-and...
  [6] http://www.botproductions.com/stellar/ corona_australis.html
  [7] ap090425.html
  [8] http://members.nova.org/~sol/chview/chv5.htm
  [9] image/1809/NGC6727-drudis1024_annot.jpg
  [10] ap011228.html
  [11] ap031226.html
  [12] http://arxiv.org/abs/1211.6945
  [13] http://www.solstation.com/stars/r-coraus.htm
  [14] http://hubblesite.org/news_release/news/2011-... 107-illustrations
  [15] ap111027.html
  [16] ap180919.html
  [17] archivepix.html
  [18] lib/apsubmit2015.html
  [19] lib/aptree.html
  [20] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [21] calendar/allyears.html
  [22] /apod.rss
  [23] lib/edlinks.html
  [24] lib/about_apod.html
  [25] http://asterisk.apod.com/discuss_apod.php?dat...
  [26] ap180921.html
  [27] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [28] http://www.phy.mtu.edu/
  [29] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [30] http://www.astro.umd.edu/
  [31] lib/about_apod.html#srapply
  [32] https://www.nasa.gov/about/highlights/HP_Priv...
  [33] https://astrophysics.gsfc.nasa.gov/
  [34] https://www.nasa.gov/
  [35] https://www.nasa.gov/centers/goddard/
  [36] http://www.mtu.edu/

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