by APOD Robot » Tue Nov 21, 2023 5:05 am
Fleming's Triangular Wisp
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
Veil Nebula. The
Veil Nebula itself is a large
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
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
Cygnus Loop and cataloged as
NGC 6979, the
Veil Nebula now spans about 6 times the diameter of the
full Moon. The length of the wisp corresponds to about 30
light years, given its estimated distance of 2,400 light years. Often identified as Pickering's Triangle for a director of
Harvard College Observatory, it is perhaps better named for its discoverer,
astronomer Williamina Fleming, as
Fleming's Triangular Wisp.
[url=https://apod.nasa.gov/apod/ap231121.html] [img]https://apod.nasa.gov/apod/calendar/S_231121.jpg[/img] [size=150]Fleming's Triangular Wisp[/size][/url]
[b] Explanation: [/b] 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 [url=https://apod.nasa.gov/apod/ap220622.html]Veil Nebula[/url]. The [url=https://en.wikipedia.org/wiki/Veil_Nebula]Veil Nebula[/url] itself is a large [url=https://chandra.harvard.edu/xray_sources/supernovas.html]supernova remnant[/url], 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 [url=https://ui.adsabs.harvard.edu/abs/2001AJ....122..938D/abstract]glowing filaments[/url] 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 [url=https://youtu.be/3MJChWEmtUw]Cygnus Loop[/url] and cataloged as [url=https://youtu.be/vk0_PYyzvm8]NGC 6979[/url], the [url=http://archive.stsci.edu/fuse/scisumm/sci_cyglpstar.html]Veil Nebula now spans[/url] about 6 times the diameter of the [url=https://apod.nasa.gov/apod/ap140113.html]full Moon[/url]. The length of the wisp corresponds to about 30 [url=https://spaceplace.nasa.gov/light-year/en/]light years[/url], given its estimated distance of 2,400 light years. Often identified as Pickering's Triangle for a director of [url=https://hea-www.harvard.edu/~fine/Observatory/newest.html]Harvard College Observatory[/url], it is perhaps better named for its discoverer, [url=https://en.wikipedia.org/wiki/Williamina_Fleming]astronomer Williamina Fleming[/url], as [url=http://www.davidcortner.com/slowblog/20161113.php]Fleming's Triangular Wisp[/url].
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