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 November 21
    [2]A nebula consisting of blue and red wisps starts thin at the image
     bottom but expands into a triangle at the image top. Please see the
                 explanation for more detailed information.

                          Fleming's Triangular Wisp
                Image Credit & Copyright: [3]Cristiano Gualco

   Explanation: These chaotic and tangled filaments of shocked, glowing
   gas are spread across planet Earth's sky toward the constellation of
   Cygnus as part of the [4]Veil Nebula. The [5]Veil Nebula itself is a
   large [6]supernova remnant, an expanding cloud born of the death
   explosion of a massive star. Light from the original supernova
   explosion likely reached Earth over 5,000 years ago. The [7]glowing
   filaments are really more like long ripples in a sheet seen almost edge
   on, remarkably well separated into the glow of ionized hydrogen atoms
   shown in red and oxygen in blue hues. Also known as the [8]Cygnus Loop
   and cataloged as [9]NGC 6979, the [10]Veil Nebula now spans about 6
   times the diameter of the [11]full Moon. The length of the wisp
   corresponds to about 30 [12]light years, given its estimated distance
   of 2,400 light years. Often identified as Pickering's Triangle for a
   director of [13]Harvard College Observatory, it is perhaps better named
   for its discoverer, [14]astronomer Williamina Fleming, as [15]Fleming's
   Triangular Wisp.

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    Authors & editors: [28]Robert Nemiroff ([29]MTU) & [30]Jerry Bonnell
                                 ([31]UMCP)
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                A service of: [34]ASD at [35]NASA / [36]GSFC,
                         [37]NASA Science Activation
                           & [38]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2311/FlemingsWisp_Gualco_2801.jpg
   3. https://www.astrobin.com/users/CristianoGualco/
   4. https://apod.nasa.gov/apod/ap220622.html
   5. https://en.wikipedia.org/wiki/Veil_Nebula
   6. https://chandra.harvard.edu/xray_sources/supernovas.html
   7. https://ui.adsabs.harvard.edu/abs/2001AJ....122..938D/abstract
   8. https://youtu.be/3MJChWEmtUw
   9. https://youtu.be/vk0_PYyzvm8
  10. http://archive.stsci.edu/fuse/scisumm/sci_cyglpstar.html
  11. https://apod.nasa.gov/apod/ap140113.html
  12. https://spaceplace.nasa.gov/light-year/en/
  13. https://hea-www.harvard.edu/~fine/Observatory/newest.html
  14. https://en.wikipedia.org/wiki/Williamina_Fleming
  15. http://www.davidcortner.com/slowblog/20161113.php
  16. https://t.me/apod_telegram
  17. https://apod.nasa.gov/apod/ap231120.html
  18. https://apod.nasa.gov/apod/archivepix.html
  19. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  20. https://apod.nasa.gov/apod/lib/aptree.html
  21. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  22. https://apod.nasa.gov/apod/calendar/allyears.html
  23. https://apod.com/feed.rss
  24. https://apod.nasa.gov/apod/lib/edlinks.html
  25. https://apod.nasa.gov/apod/lib/about_apod.html
  26. https://asterisk.apod.com/discuss_apod.php?date=231121
  27. https://apod.nasa.gov/apod/ap231122.html
  28. http://www.phy.mtu.edu/faculty/Nemiroff.html
  29. http://www.phy.mtu.edu/
  30. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  31. http://www.astro.umd.edu/
  32. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  33. https://www.nasa.gov/about/highlights/HP_Privacy.html
  34. https://astrophysics.gsfc.nasa.gov/
  35. https://www.nasa.gov/
  36. https://www.nasa.gov/centers/goddard/
  37. https://science.nasa.gov/learners
  38. http://www.mtu.edu/