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.

                              2024 September 10
    [2]The featured image a starfield that glows gold. On the left is the
     dark horsehead nebula, while on the right is the blue-glowing Orion
      Nebula. Please see the explanation for more detailed information.

                         Horsehead and Orion Nebulas
             Image Credit & Copyright: [3]Antoine & Dalia Grelin

   Explanation: The dark [4]Horsehead Nebula and the glowing [5]Orion
   Nebula are contrasting cosmic vistas. Adrift 1,500 light-years away in
   one of [6]the night sky's most recognizable [7]constellations, they
   appear in opposite corners of the above [8]stunning mosaic. The
   familiar [9]Horsehead nebula appears as a dark cloud, a [10]small
   silhouette notched against the long glow of hydrogen -- here shown in
   gold -- at the lower left. [11]Alnitak is the easternmost star in
   [12]Orion's belt and is seen as the brightest [13]star just below and
   to the left of the [14]Horsehead. To the left of Alnitak is the
   [15]Flame Nebula, with clouds of bright emission and [16]dramatic dark
   dust lanes. The magnificent emission region, the [17]Orion Nebula (aka
   M42), lies at the upper right. Immediately to its left is a prominent
   [18]reflection nebula sometimes called the Running Man. Pervasive
   [19]tendrils of glowing hydrogen gas are easily [20]traced throughout
   the region.

     Astrophysicists: [21]Browse 3,500+ codes in the Astrophysics Source
                                Code Library
                     Tomorrow's picture: river meets sky
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    Authors & editors: [33]Robert Nemiroff ([34]MTU) & [35]Jerry Bonnell
                                 ([36]UMCP)
          NASA Official: Amber Straughn [37]Specific rights apply.
            [38]NASA Web Privacy, [39]Accessibility, [40]Notices;
                A service of: [41]ASD at [42]NASA / [43]GSFC,
                         [44]NASA Science Activation
                           & [45]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2409/OrionOrange_Grelin_9371.jpg
   3. https://www.galactic-hunter.com/about
   4. https://apod.nasa.gov/apod/ap231120.html
   5. https://apod.nasa.gov/apod/ap191030.html
   6. https://apod.nasa.gov/apod/ap220416.html
   7. https://en.wikipedia.org/wiki/Constellation
   8. https://www.galactic-hunter.com/post/ic-434-the-horsehead-flame-nebulae
   9. https://en.wikipedia.org/wiki/Horsehead_Nebula
  10. https://i.redd.it/9lmbxkkm9bm41.jpg
  11. https://www.gb.nrao.edu/~rmaddale/Education/OrionTourCenter/belt.html
  12. https://apod.nasa.gov/apod/ap090210.html
  13. https://science.nasa.gov/universe/stars/
  14. https://www.liveabout.com/horse-head-drawing-step-by-step-tutorial-1123322
  15. https://apod.nasa.gov/apod/ap221229.html
  16. https://apod.nasa.gov/apod/ap090929.html
  17. https://en.wikipedia.org/wiki/Orion_nebula
  18. http://antwrp.gsfc.nasa.gov/apod/reflection_nebulae.html
  19. https://apod.nasa.gov/apod/ap090224.html
  20. https://youtu.be/-PQpNb_yJVE
  21. http://ascl.net/
  22. https://apod.nasa.gov/apod/ap240909.html
  23. https://apod.nasa.gov/apod/archivepix.html
  24. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  25. https://apod.nasa.gov/apod/lib/aptree.html
  26. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  27. https://apod.nasa.gov/apod/calendar/allyears.html
  28. https://apod.com/feed.rss
  29. https://apod.nasa.gov/apod/lib/edlinks.html
  30. https://apod.nasa.gov/apod/lib/about_apod.html
  31. https://asterisk.apod.com/discuss_apod.php?date=240910
  32. https://apod.nasa.gov/apod/ap240911.html
  33. http://www.phy.mtu.edu/faculty/Nemiroff.html
  34. http://www.phy.mtu.edu/
  35. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  36. http://www.astro.umd.edu/
  37. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  38. https://www.nasa.gov/about/highlights/HP_Privacy.html
  39. https://www.nasa.gov/general/accessibility/
  40. https://www.nasa.gov/privacy/
  41. https://astrophysics.gsfc.nasa.gov/
  42. https://www.nasa.gov/
  43. https://www.nasa.gov/centers/goddard/
  44. https://science.nasa.gov/learners
  45. http://www.mtu.edu/