by APOD Robot » Sun May 22, 2016 4:06 am
LL Orionis: When Cosmic Winds Collide
Explanation: What created this great arc in space? This
arcing, graceful structure is actually a
bow shock about half a light-year across, created as the wind from young star LL Orionis collides with the
Orion Nebula flow. Adrift in Orion's
stellar nursery and still in its formative years, variable star
LL Orionis produces a wind more energetic than
the wind from our own middle-aged sun. As the fast stellar wind runs into slow moving gas a shock front is formed, analogous to the
bow wave of a
boat moving through water or a plane traveling at
supersonic speed. The slower gas is flowing away from the
Orion Nebula's hot central star cluster, the
Trapezium, located off the lower right hand edge of the picture. In
three dimensions, LL Ori's wrap-around shock front is shaped like a bowl that appears brightest when viewed along the "bottom" edge.
The complex stellar nursery in Orion shows a myriad of similar
fluid shapes associated with
star formation, including the bow shock surrounding a faint star at the upper right. Part of
a mosaic covering the Great Nebula in Orion,
this composite color image was recorded in 1995 by the Hubble Space Telescope.
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[url=http://apod.nasa.gov/apod/ap160522.html][img]http://apod.nasa.gov/apod/calendar/S_160522.jpg[/img] [size=150]LL Orionis: When Cosmic Winds Collide[/size][/url]
[b] Explanation: [/b] What created this great arc in space? This [url=http://hubblesite.org/newscenter/newsdesk/archive/releases/2002/05/]arcing, graceful structure[/url] is actually a [url=https://en.wikipedia.org/wiki/Bow_shocks_in_astrophysics]bow shock[/url] about half a light-year across, created as the wind from young star LL Orionis collides with the [url=http://apod.nasa.gov/apod/ap020213.html]Orion Nebula[/url] flow. Adrift in Orion's [url=http://archive.ncsa.uiuc.edu/Cyberia/Bima/StarForm.html]stellar nursery[/url] and still in its formative years, variable star [url=http://apod.nasa.gov/apod/ap130203.html]LL Orionis[/url] produces a wind more energetic than [url=http://www-spof.gsfc.nasa.gov/Education/wsolwind.html]the wind[/url] from our own middle-aged sun. As the fast stellar wind runs into slow moving gas a shock front is formed, analogous to the [url=http://www.ma.hw.ac.uk/solitons/LocalHeroes/sr.html]bow wave[/url] of a [url=http://footage.framepool.com/shotimg/qf/956024592-bow-wave-sailing-boat-baltic-sea-sweden.jpg]boat[/url] moving through water or a plane traveling at [url=http://www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-is-supersonic-flight-k4.html]supersonic[/url] speed. The slower gas is flowing away from the [url=http://apod.nasa.gov/apod/ap130320.html]Orion Nebula[/url]'s hot central star cluster, the [url=http://apod.nasa.gov/apod/ap050710.html]Trapezium[/url], located off the lower right hand edge of the picture. In [url=https://www.youtube.com/watch?v=GjzTM6xEyJM]three dimensions[/url], LL Ori's wrap-around shock front is shaped like a bowl that appears brightest when viewed along the "bottom" edge. [url=http://cdsads.u-strasbg.fr/abs/2000AJ....119.2919B]The complex[/url] stellar nursery in Orion shows a myriad of similar [url=http://apod.nasa.gov/apod/ap990228.html]fluid[/url] [url=http://apod.nasa.gov/apod/ap010504.html]shapes[/url] associated with [url=http://jwst.nasa.gov/birth.html]star formation[/url], including the bow shock surrounding a faint star at the upper right. Part of [url=http://apod.nasa.gov/apod/ap951121.html]a mosaic[/url] covering the Great Nebula in Orion, [url=http://hubblesite.org/newscenter/newsdesk/archive/releases/2002/05/fastfacts/]this composite[/url] color image was recorded in 1995 by the Hubble Space Telescope.
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