by APOD Robot » Mon Aug 13, 2018 4:06 am
The Pencil Nebula in Red and Blue
Explanation: This shock wave plows through interstellar space at over 500,000 kilometers per hour. Near the top and moving up in this sharply detailed color composite, thin, bright, braided filaments are actually long ripples in a cosmic sheet of glowing gas seen almost edge-on.
Cataloged as NGC 2736, its elongated appearance suggests its popular name,
the Pencil Nebula. The
Pencil Nebula is about 5 light-years long and 800
light-years away, but represents only a small part of the
Vela supernova remnant. The
Vela remnant itself is around 100 light-years in diameter, the expanding
debris cloud of a star that was seen to
explode about 11,000 years ago. Initially, the
shock wave was moving at millions of kilometers per hour but has slowed considerably, sweeping up surrounding interstellar material. In the featured narrow-band, wide field image, red and blue colors track the characteristic glow of
ionized hydrogen and
oxygen atoms, respectively.
[url=https://apod.nasa.gov/apod/ap180813.html] [img]https://apod.nasa.gov/apod/calendar/S_180813.jpg[/img] [size=150]The Pencil Nebula in Red and Blue[/size][/url]
[b] Explanation: [/b] This shock wave plows through interstellar space at over 500,000 kilometers per hour. Near the top and moving up in this sharply detailed color composite, thin, bright, braided filaments are actually long ripples in a cosmic sheet of glowing gas seen almost edge-on. [url=http://heritage.stsci.edu/2003/16/supplemental.html]Cataloged as NGC 2736[/url], its elongated appearance suggests its popular name, [url=http://www.nasa.gov/vision/universe/starsgalaxies/pencil_nebula.html]the Pencil Nebula[/url]. The [url=https://www.youtube.com/watch?v=P4rXhOArFw8]Pencil Nebula[/url] is about 5 light-years long and 800 [url=https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html]light-years[/url] away, but represents only a small part of the [url=http://violet.pha.jhu.edu/~wpb/hstvela/hstvela.html]Vela supernova remnant[/url]. The [url=https://apod.nasa.gov/apod/ap080306.html]Vela remnant itself[/url] is around 100 light-years in diameter, the expanding [url=http://chandra.harvard.edu/xray_sources/supernovas.html]debris cloud of a star[/url] that was seen to [url=https://apod.nasa.gov/apod/ap131001.html]explode[/url] about 11,000 years ago. Initially, the [url=https://apod.nasa.gov/apod/ap170408.html]shock wave[/url] was moving at millions of kilometers per hour but has slowed considerably, sweeping up surrounding interstellar material. In the featured narrow-band, wide field image, red and blue colors track the characteristic glow of [url=http://astronomy.swin.edu.au/cosmos/i/ionised+hydrogen]ionized hydrogen[/url] and [url=https://periodic.lanl.gov/8.shtml]oxygen atoms[/url], respectively.
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