File:Abell 520.PNG

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Summary

DescriptionAbell 520.PNG	Abell 520 galaxy cluster with regions dominated by Dark matter color coded blue. The configurations evident in this photograph indicate a possible self-interaction of dark-matter through an as-yet unknown force or forces.
Date	August 16, 2007 (date of article publication)
Source	http://www.nasa.gov/mission_pages/chandra/multimedia/photos07-090.html
Author	X-ray: NASA/CXC/UVic./A. Mahdavi et al. Optical/lensing: CFHT/UVic./H. Hoekstra et al.

	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.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	13:16, 28 December 2007		792 × 792 (1.21 MB)	Mathiasrex	{{Information \|Description=Abell 520 galaxy cluster \|Source=http://www.nasa.gov/mission_pages/chandra/multimedia/photos07-090.html \|Date=? \|Author=NASA \|Permission= \|other_versions= }}

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