Lêer:Stephan's Quintet X-ray + Optical.jpg

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English: Stephan's Quintet – A Galaxy Collision in Action
Stephan's Quintet, a compact group of galaxies discovered about 130 years ago and located about 280 million light years from Earth, provides a rare opportunity to observe a galaxy group in the process of evolving from an X-ray faint system dominated by spiral galaxies to a more developed system dominated by elliptical galaxies and bright X-ray emission. Being able to witness the dramatic effect of collisions in causing this evolution is important for increasing our understanding of the origins of the hot, X-ray bright halos of gas in groups of galaxies.
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Bron NASA Image of the Day Gallery, url=http://www.nasa.gov/multimedia/imagegallery/image_feature_1408.html
Outeur Image Credits: X-ray: NASA/CXC/CfA/E. O'Sullivan Optical: Canada-France-Hawaii-Telescope/Coelum
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(Hergebruik van die lêer)		 Images from NASA usually are free of copyright.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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huidig06:50, 16 November 2009Duimnaelskets vir weergawe vanaf 06:50, 16 November 2009946 × 710 (51 KG)Marshallsumter{{Information |Description={{en|1=Stephan's Quintet--A Galaxy Collision in Action Stephan's Quintet, a compact group of galaxies discovered about 130 years ago and located about 280 million light years from Earth, provides a rare opportunity to observe a

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