﻿ 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. New: [16]Follow APOD on Telegram Tomorrow's picture: open space __________________________________________________________________ [17]< | [18]Archive | [19]Submissions | [20]Index | [21]Search | [22]Calendar | [23]RSS | [24]Education | [25]About APOD | [26]Discuss | [27]> __________________________________________________________________ Authors & editors: [28]Robert Nemiroff ([29]MTU) & [30]Jerry Bonnell ([31]UMCP) NASA Official: Phillip Newman [32]Specific rights apply. [33]NASA Web Privacy Policy and Important Notices 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/