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.

                               2019 August 27
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                 Dark Dust and Colorful Clouds near Antares
                       Image Credit: [3]David McGarvey

   Explanation: Why is the sky near [4]Antares and [5]Rho Ophiuchi so
   dusty yet colorful? The colors result from a mixture of objects and
   processes. Fine dust illuminated from the front by starlight produces
   blue [6]reflection nebulae. Gaseous clouds whose atoms are excited by
   [7]ultraviolet starlight produce reddish [8]emission nebulae. Backlit
   [9]dust clouds block starlight and so [10]appear dark. [11]Antares, a
   [12]red supergiant and one of the [13]brighter stars in the night sky,
   lights up the yellow-red clouds on the lower left of the featured
   image. [14]Rho Ophiuchi lies at the center of the blue nebula near the
   top. The distant [15]globular cluster [16]M4 is visible to the right of
   Antares. These star clouds are even more [17]colorful than humans can
   see, emitting light across the [18]electromagnetic spectrum.

                     Tomorrow's picture: galaxy portrait
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    Authors & editors: [30]Robert Nemiroff ([31]MTU) & [32]Jerry Bonnell
                                 ([33]UMCP)
          NASA Official: Phillip Newman [34]Specific rights apply.
              [35]NASA Web Privacy Policy and Important Notices
                A service of: [36]ASD at [37]NASA / [38]GSFC
                           & [39]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1908/AntaresRho_McGarvey_2200.jpg
   3. mailto: david_mcgarvey @at@ Hotmail .dot. com
   4. https://en.wikipedia.org/wiki/Antares
   5. http://en.wikipedia.org/wiki/Rho_Ophiuchi_cloud_complex
   6. https://apod.nasa.gov/apod/ap031229.html
   7. https://science.nasa.gov/ems/10_ultravioletwaves
   8. https://apod.nasa.gov/apod/ap120214.html
   9. https://apod.nasa.gov/apod/ap030706.html
  10. https://apod.nasa.gov/apod/ap120129.html
  11. http://stars.astro.illinois.edu/sow/antares.html
  12. http://hyperphysics.phy-astr.gsu.edu/hbase/astro/redsup.html
  13. http://www.astro.wisc.edu/~dolan/constellations/extra/brightest.html
  14. https://apod.nasa.gov/apod/ap100524.html
  15. https://apod.nasa.gov/apod/globular_clusters.html
  16. https://apod.nasa.gov/apod/ap000523.html
  17. https://www.nasa.gov/audience/forkids/kidsclub/flash/clubhouse/Color_NASA.html
  18. https://science.nasa.gov/ems/01_intro
  19. https://apod.nasa.gov/apod/ap190826.html
  20. https://apod.nasa.gov/apod/archivepix.html
  21. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  22. https://apod.nasa.gov/apod/lib/aptree.html
  23. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  24. https://apod.nasa.gov/apod/calendar/allyears.html
  25. https://apod.nasa.gov/apod.rss
  26. https://apod.nasa.gov/apod/lib/edlinks.html
  27. https://apod.nasa.gov/apod/lib/about_apod.html
  28. http://asterisk.apod.com/discuss_apod.php?date=190827
  29. https://apod.nasa.gov/apod/ap190828.html
  30. http://www.phy.mtu.edu/faculty/Nemiroff.html
  31. http://www.phy.mtu.edu/
  32. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  33. http://www.astro.umd.edu/
  34. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  35. https://www.nasa.gov/about/highlights/HP_Privacy.html
  36. https://astrophysics.gsfc.nasa.gov/
  37. https://www.nasa.gov/
  38. https://www.nasa.gov/centers/goddard/
  39. http://www.mtu.edu/