by owlice » Sun Dec 19, 2010 9:42 pm
Sharpless 238 and Surrounding Dust
http://www.ccdimages.com/sharpless/sh2-238big.jpg
Copyright: Dean Salman
Orion 18-frame Mosaic in H-alpha
http://www.fpsoftlab.com/gallery/
http://www.fireplant.com/deepsky/orion_ ... _stars.jpg
Copyright: Igor Chekalin
[attachment=3]Orion Mosaic.jpg[/attachment][/i]
Memory of an Evening in May
Copyright: Matthew Ventura
[attachment=2]Moon Venus Ventura.jpg[/attachment][/i]
Spiral Outburst Surrounding Astroid Scheila-596
Copyright: Ype de Lang
[attachment=1]astroide-schiela596-spiraloutburst17122010-2xcrop-g11-g3combi.jpg[/attachment][/b]
The Heart of M42
http://www.starshadows.com/gallery/disp ... ?imgID=387
Credit and copyright: Steve Mazlin, Jack Harvey, Daniel Verschatse, and RickGilbert (SSRO at PROMPT/CTIO)
Comet Machholz through UV Eyes
http://arxiv.org/abs/1011.4313
Credit: Jeffrey P. Morgenthaler, Walter M. Harris, Michael R. Combi, Paul D. Feldman, Harold A. Weaver
[attachment=0]Machholz-fd-move-masked-backsub.jpeg[/attachment][/i]
This image was recorded by the Galaxy Evolution Explorer (GALEX) (
http://www.galex.caltech.edu/index.html) at far ultraviolet wavelengths (135 -- 750 nm), where atomic carbon has two bright emission features. Unlike dust, which is pushed away from the comet by solar radiation pressure to create the characteristic white tail that is associated with comets, carbon, like most atoms and molecules is not big enough to receive any push. Carbon therefore floats away from the comet more-or-less uniformly in all directions, forming a spherically symmetric envelope, or "coma." The carbon coma is detected to distances of over 1 million km from comet Machholz.
A team of researchers led by Jeff Morgenthaler at the Planetary Science Institute (
http://www.psi.edu) used the fall-off of the carbon emission as a function of distance from the comet to measure how long the average carbon atom lives in interplanetary space before it is ionized. The answer: one to two weeks. This is a long time, but only about half as long as previously thought. The shorter value implies that previous measurements of the amount of carbon coming from comets may have been too large. This might affect theories about the formation of comets in the early solar system. ~ Jeff Morgenthaler
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[size=120][b]Sharpless 238 and Surrounding Dust[/b][/size]
http://www.ccdimages.com/sharpless/sh2-238big.jpg
Copyright: Dean Salman
[img2]http://www.ccdimages.com/sharpless/sh2-238c.jpg[/img2]
[size=120][b]Orion 18-frame Mosaic in H-alpha[/b][/size]
http://www.fpsoftlab.com/gallery/
http://www.fireplant.com/deepsky/orion_ha_29-11-2008_1and8-11-2010_18frames_3x15min_proc3_size33percent_color_stars.jpg
Copyright: Igor Chekalin
[size=80][i][attachment=3]Orion Mosaic.jpg[/attachment][/i][/size]
[size=120][b]Memory of an Evening in May[/b][/size]
Copyright: Matthew Ventura
[size=80][i][attachment=2]Moon Venus Ventura.jpg[/attachment][/i][/size]
[size=120][b]Spiral Outburst Surrounding Astroid Scheila-596[/b][/size]
Copyright: Ype de Lang
[size=80][b][attachment=1]astroide-schiela596-spiraloutburst17122010-2xcrop-g11-g3combi.jpg[/attachment][/b][/size]
[size=120][b]The Heart of M42[/b][/size]
http://www.starshadows.com/gallery/display.cfm?imgID=387
Credit and copyright: Steve Mazlin, Jack Harvey, Daniel Verschatse, and RickGilbert (SSRO at PROMPT/CTIO)
[img2]http://www.starshadows.com/_img/image/gallery/4/mid/Trapezium_Master3.jpg[/img2]
[size=120][b]Comet Machholz through UV Eyes[/b][/size]
http://arxiv.org/abs/1011.4313
Credit: Jeffrey P. Morgenthaler, Walter M. Harris, Michael R. Combi, Paul D. Feldman, Harold A. Weaver
[float=left][size=80][i][attachment=0]Machholz-fd-move-masked-backsub.jpeg[/attachment][/i][/size][/float]
This image was recorded by the Galaxy Evolution Explorer (GALEX) (http://www.galex.caltech.edu/index.html) at far ultraviolet wavelengths (135 -- 750 nm), where atomic carbon has two bright emission features. Unlike dust, which is pushed away from the comet by solar radiation pressure to create the characteristic white tail that is associated with comets, carbon, like most atoms and molecules is not big enough to receive any push. Carbon therefore floats away from the comet more-or-less uniformly in all directions, forming a spherically symmetric envelope, or "coma." The carbon coma is detected to distances of over 1 million km from comet Machholz.
A team of researchers led by Jeff Morgenthaler at the Planetary Science Institute (http://www.psi.edu) used the fall-off of the carbon emission as a function of distance from the comet to measure how long the average carbon atom lives in interplanetary space before it is ionized. The answer: one to two weeks. This is a long time, but only about half as long as previously thought. The shorter value implies that previous measurements of the amount of carbon coming from comets may have been too large. This might affect theories about the formation of comets in the early solar system. ~ Jeff Morgenthaler