Astronomy Picture of the Day

   [1]Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                                2021 August 6
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                   Stars and Dust Across Corona Australis
                Image Credit & [3]Copyright: [4]Vikas Chander

   Explanation: Cosmic dust clouds cross a rich field of stars in this
   telescopic vista near the northern boundary of [5]Corona Australis, the
   Southern Crown. Less than 500 light-years away the dust clouds
   effectively [6]block light from more distant background stars in the
   [7]Milky Way. Top to bottom the frame spans about 2 degrees or over 15
   light-years at the clouds' estimated distance. [8]At top right is a
   group of lovely reflection nebulae cataloged as [9]NGC 6726, 6727,
   6729, and IC 4812. A characteristic blue color is produced as light
   from hot stars is [10]reflected by the cosmic dust. The dust also
   obscures from view stars [11]in the region still in the process of
   formation. Just above the bluish reflection nebulae a smaller NGC 6729
   surrounds [12]young variable star [13]R Coronae Australis. To its right
   are telltale reddish arcs and loops identified as [14]Herbig Haro
   objects associated with energetic newborn stars. Magnificent
   [15]globular star cluster NGC 6723 is at bottom left in the frame.
   Though NGC 6723 appears [16]to be part of the group, its ancient stars
   actually lie nearly 30,000 light-years away, far beyond the young stars
   of the [17]Corona Australis dust clouds.

                     Tomorrow's picture: Stereo Saturday
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    Authors & editors: [29]Robert Nemiroff ([30]MTU) & [31]Jerry Bonnell
                                 ([32]UMCP)
          NASA Official: Phillip Newman [33]Specific rights apply.
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                A service of: [35]ASD at [36]NASA / [37]GSFC
                           & [38]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2108/NGC6726_6723_2panel.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. ://www.facebook.com/vikas.chander.58
   5. http://www.botproductions.com/stellar/corona_australis.html
   6. https://apod.nasa.gov/apod/ap090425.html
   7. http://members.nova.org/~sol/chview/chv5.htm
   8. https://apod.nasa.gov/apod/image/0407/ngc6726_wide_tanlbl1.jpg
   9. https://theskylive.com/sky/deepsky/ngc6726-object
  10. https://apod.nasa.gov/apod/ap011228.html
  11. http://arxiv.org/abs/1211.6945
  12. https://apod.nasa.gov/apod/ap031226.html
  13. http://www.solstation.com/stars/r-coraus.htm
  14. https://apod.nasa.gov/apod/ap111027.html
  15. https://apod.nasa.gov/apod/ap120614.html
  16. http://photojournal.jpl.nasa.gov/catalog/PIA13064
  17. http://www.eso.org/public/videos/eso1109a/
  18. https://apod.nasa.gov/apod/ap210805.html
  19. https://apod.nasa.gov/apod/archivepix.html
  20. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  21. https://apod.nasa.gov/apod/lib/aptree.html
  22. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  23. https://apod.nasa.gov/apod/calendar/allyears.html
  24. https://apod.nasa.gov/apod.rss
  25. https://apod.nasa.gov/apod/lib/edlinks.html
  26. https://apod.nasa.gov/apod/lib/about_apod.html
  27. http://asterisk.apod.com/discuss_apod.php?date=210806
  28. https://apod.nasa.gov/apod/ap210807.html
  29. http://www.phy.mtu.edu/faculty/Nemiroff.html
  30. http://www.phy.mtu.edu/
  31. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  32. http://www.astro.umd.edu/
  33. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  34. https://www.nasa.gov/about/highlights/HP_Privacy.html
  35. https://astrophysics.gsfc.nasa.gov/
  36. https://www.nasa.gov/
  37. https://www.nasa.gov/centers/goddard/
  38. http://www.mtu.edu/