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 21
    [2]See Explanation. Moving the cursor over the image will bring up an
     annotated version. Clicking on the image will bring up the highest
                        resolution version available.

                        The Orion You Can Almost See
    Image Credit & Copyright: [3]John Gleason & [4]Rogelio Bernal Andreo

   Explanation: Do you recognize this constellation? Although it is one of
   the [5]most recognizable star groupings on the sky, [6]this is a
   [7]more full Orion than you can see -- an Orion only revealed with long
   exposure digital camera imaging and [8]post-processing. Here the cool
   [9]red giant [10]Betelgeuse takes on a strong orange tint as the
   brightest star at the lower left. Orion's hot blue stars are numerous,
   with [11]supergiant [12]Rigel balancing Betelgeuse on the upper right,
   and [13]Bellatrix at the upper left. Lined up in [14]Orion's belt are
   three stars [15]all about 1,500 [16]light-years away, born from the
   constellation's well-studied [17]interstellar clouds. To the right of
   Orion's belt is a bright but fuzzy patch that might also [18]look
   familiar -- the stellar nursery known as [19]Orion's Nebula. Finally,
   just barely visible to the [20]unaided eye but quite striking here is
   [21]Barnard's Loop -- a huge gaseous emission nebula surrounding
   Orion's Belt and Nebula discovered over 100 years ago by the pioneering
   Orion photographer [22]E. E. Barnard.

           APOD Podcasts: Available on [23]iTunes and [24]YouTube.
                     Tomorrow's picture: southern galaxy
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    Authors & editors: [36]Robert Nemiroff ([37]MTU) & [38]Jerry Bonnell
                                 ([39]UMCP)
          NASA Official: Phillip Newman [40]Specific rights apply.
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                A service of: [42]ASD at [43]NASA / [44]GSFC
                           & [45]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1908/OrionDeep_GleasonAndreo_2048.jpg
   3. https://www.astrobin.com/users/dvj/
   4. https://en.wikipedia.org/wiki/Rogelio_Bernal_Andreo
   5. https://en.wikipedia.org/wiki/Orion_(constellation)
   6. https://c1.staticflickr.com/1/797/39937927085_a53d44956a_o.jpg
   7. https://apod.nasa.gov/apod/ap151123.html
   8. http://cdn-www.cracked.com/articleimages/ob/old_computer.jpg
   9. https://en.wikipedia.org/wiki/Red_giant
  10. https://apod.nasa.gov/apod/ap100106.html
  11. https://en.wikipedia.org/wiki/Supergiant_star
  12. https://apod.nasa.gov/apod/ap180115.html
  13. http://earthsky.org/tonight/bellatrix-orions-third-brightest-means-female-warrior
  14. https://apod.nasa.gov/apod/ap170604.html
  15. https://www.youtube.com/watch?v=lD-5ZOipE48
  16. https://www.grc.nasa.gov/www/k-12/Numbers/Math/Mathematical_Thinking/how_long_is_a_light_year.htm
  17. http://astronomy.swin.edu.au/cosmos/I/Interstellar+Gas+Cloud
  18. https://www.youtube.com/watch?v=-EjukzL-bJc
  19. https://apod.nasa.gov/apod/ap171129.html
  20. https://www.aoa.org/patients-and-public/resources-for-teachers/how-your-eyes-work
  21. https://en.wikipedia.org/wiki/Barnard's_Loop
  22. https://en.wikipedia.org/wiki/Edward_Emerson_Barnard
  23. https://podcasts.apple.com/us/podcast/astronomy-photo-of-the-day-2019/id428500031
  24. https://www.youtube.com/channel/UCWksELVw1LfYg6TiLQyjByw/featured
  25. https://apod.nasa.gov/apod/ap190820.html
  26. https://apod.nasa.gov/apod/archivepix.html
  27. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  28. https://apod.nasa.gov/apod/lib/aptree.html
  29. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  30. https://apod.nasa.gov/apod/calendar/allyears.html
  31. https://apod.nasa.gov/apod.rss
  32. https://apod.nasa.gov/apod/lib/edlinks.html
  33. https://apod.nasa.gov/apod/lib/about_apod.html
  34. http://asterisk.apod.com/discuss_apod.php?date=190821
  35. https://apod.nasa.gov/apod/ap190822.html
  36. http://www.phy.mtu.edu/faculty/Nemiroff.html
  37. http://www.phy.mtu.edu/
  38. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  39. http://www.astro.umd.edu/
  40. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  41. https://www.nasa.gov/about/highlights/HP_Privacy.html
  42. https://astrophysics.gsfc.nasa.gov/
  43. https://www.nasa.gov/
  44. https://www.nasa.gov/centers/goddard/
  45. http://www.mtu.edu/