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.

                                2021 July 27
   [2]The picture shows Fleming's Triangular Wisp, part of the Veil Nebula
       supernova remnant. Please see the explanation for more detailed
                                information.

                          Fleming's Triangular Wisp
                  Image Credit & Copyright: [3]Anthony Saab

   Explanation: Chaotic in appearance, these 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 blue and oxygen in red 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 also named for
   its discoverer, [14]astronomer Williamina Fleming, as [15]Fleming's
   Triangular Wisp.

                   Tomorrow's picture: ring of fire galaxy
     __________________________________________________________________

      [16]< | [17]Archive | [18]Submissions | [19]Index | [20]Search |
   [21]Calendar | [22]RSS | [23]Education | [24]About APOD | [25]Discuss |
                                    [26]>
     __________________________________________________________________

    Authors & editors: [27]Robert Nemiroff ([28]MTU) & [29]Jerry Bonnell
                                 ([30]UMCP)
          NASA Official: Phillip Newman [31]Specific rights apply.
              [32]NASA Web Privacy Policy and Important Notices
                A service of: [33]ASD at [34]NASA / [35]GSFC
                           & [36]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2107/FlemingsTriangle_Saab_4546.jpg
   3. https://www.instagram.com/anthonyrsaab/
   4. https://apod.nasa.gov/apod/ap191031.html
   5. https://en.wikipedia.org/wiki/Veil_Nebula
   6. http://chandra.harvard.edu/xray_sources/supernovas.html
   7. http://arxiv.org/abs/astro-ph/0104243
   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://apod.nasa.gov/apod/ap210726.html
  17. https://apod.nasa.gov/apod/archivepix.html
  18. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  19. https://apod.nasa.gov/apod/lib/aptree.html
  20. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  21. https://apod.nasa.gov/apod/calendar/allyears.html
  22. https://apod.nasa.gov/apod.rss
  23. https://apod.nasa.gov/apod/lib/edlinks.html
  24. https://apod.nasa.gov/apod/lib/about_apod.html
  25. http://asterisk.apod.com/discuss_apod.php?date=210727
  26. https://apod.nasa.gov/apod/ap210728.html
  27. http://www.phy.mtu.edu/faculty/Nemiroff.html
  28. http://www.phy.mtu.edu/
  29. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  30. http://www.astro.umd.edu/
  31. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  32. https://www.nasa.gov/about/highlights/HP_Privacy.html
  33. https://astrophysics.gsfc.nasa.gov/
  34. https://www.nasa.gov/
  35. https://www.nasa.gov/centers/goddard/
  36. http://www.mtu.edu/