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.

                              2023 February 14
    [2]Two red emission nebulas are shown in front of a dark but colorful
   starfield. The Soul Nebula is on the lower left, while the Heart Nebula
     is on the upper right. Please see the explanation for more detailed
                                information.

                         The Heart and Soul Nebulas
              Image Credit & Copyright: [3]Juan Lozano de Haro

   Explanation: Is the heart and soul of our Galaxy located in
   [4]Cassiopeia? Possibly not, but that is where two bright [5]emission
   nebulas nicknamed [6]Heart and Soul can be found. The [7]Heart Nebula,
   officially dubbed [8]IC 1805 and visible in the featured image on the
   upper right, has a shape reminiscent of a classical [9]heart symbol.
   The shape is perhaps fitting for [10]Valentine's Day. The [11]Soul
   Nebula is officially designated IC 1871 and is visible on the lower
   left. [12]Both nebulas shine brightly in the red light of [13]energized
   [14]hydrogen, one of three colors shown in [15]this three-color
   montage. [16]Light takes about 6,000 years to reach us from [17]these
   nebulas, which together span roughly 300 [18]light years. [19]Studies
   of stars and clusters like those found in the [20]Heart and [21]Soul
   nebulas have focused on how massive [22]stars form and how they
   [23]affect their environment.

                     Tomorrow's picture: airglow chateau
     __________________________________________________________________

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    Authors & editors: [35]Robert Nemiroff ([36]MTU) & [37]Jerry Bonnell
                                 ([38]UMCP)
          NASA Official: Phillip Newman [39]Specific rights apply.
              [40]NASA Web Privacy Policy and Important 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/2302/HeartSoul_deHaro_1977.jpg
   3. http://observatorioelche.blogspot.com/
   4. https://en.wikipedia.org/wiki/Cassiopeia_(constellation)
   5. https://apod.nasa.gov/apod/emission_nebulae.html
   6. http://www.youtube.com/watch?v=YsIL07eOqOU
   7. https://apod.nasa.gov/apod/ap220214.html
   8. https://apod.nasa.gov/apod/ap111025.html
   9. http://en.wikipedia.org/wiki/Heart_(symbol)
  10. https://en.wikipedia.org/wiki/Valentine%27s_Day
  11. https://apod.nasa.gov/apod/ap180821.html
  12. https://apod.nasa.gov/apod/ap160924.html
  13. https://apod.nasa.gov/apod/ap030410.html
  14. https://periodic.lanl.gov/1.shtml
  15. http://observatorioelche.blogspot.com/2023/01/heart-soul-nebulas-rgbha.html
  16. https://science.nasa.gov/ems/01_intro
  17. https://apod.nasa.gov/apod/ap180823.html
  18. https://chandra.harvard.edu/photo/cosmic_distance.html
  19. https://ui.adsabs.harvard.edu/abs/1999A%26AS..136..313S/abstract
  20. https://en.wikipedia.org/wiki/Heart_Nebula
  21. https://en.wikipedia.org/wiki/Soul_Nebula
  22. https://apod.nasa.gov/apod/ap210630.html
  23. https://s-media-cache-ak0.pinimg.com/564x/0a/4e/27/0a4e2732638c9d7532de25394eea6257.jpg
  24. https://apod.nasa.gov/apod/ap230213.html
  25. https://apod.nasa.gov/apod/archivepix.html
  26. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  27. https://apod.nasa.gov/apod/lib/aptree.html
  28. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  29. https://apod.nasa.gov/apod/calendar/allyears.html
  30. https://apod.nasa.gov/apod.rss
  31. https://apod.nasa.gov/apod/lib/edlinks.html
  32. https://apod.nasa.gov/apod/lib/about_apod.html
  33. http://asterisk.apod.com/discuss_apod.php?date=230214
  34. https://apod.nasa.gov/apod/ap230215.html
  35. http://www.phy.mtu.edu/faculty/Nemiroff.html
  36. http://www.phy.mtu.edu/
  37. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  38. http://www.astro.umd.edu/
  39. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  40. https://www.nasa.gov/about/highlights/HP_Privacy.html
  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/