File:Chandra Six Galaxy Cluster (X-rays).jpg

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DescriptionChandra Six Galaxy Cluster (X-rays).jpg	English: These galaxy clusters are part of a large study using Chandra and Hubble that sets new limits on how dark matter - the mysterious substance that makes up most of the matter in the Universe - interacts with itself. The hot gas that envelopes the clusters glows brightly in X-rays detected by Chandra (pink). When combined with Hubble's visible light data, astronomers can map where the stars and hot gas are after the collision, as well as the inferred distribution of dark matter (blue) through the effect of gravitational lensing.
Date	23 March 2015, 06:29:09
Source	http://chandra.harvard.edu/photo/2015/dark/dark.jpg
Author	NASA

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	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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Image title	These galaxy clusters are part of a large study using Chandra and Hubble that sets new limits on how dark matter - the mysterious substance that makes up most of the matter in the Universe - interacts with itself. The hot gas that envelopes the clusters glows brightly in X-rays detected by Chandra (pink). When combined with Hubble's visible light data, astronomers can map where the stars and hot gas are after the collision, as well as the inferred distribution of dark matter (blue) through the effect of gravitational lensing.
Author	Chandra X-ray Observatory Center
Headline	Six galaxy clusters that are part of a study of 72 colliding clusters.
Credit/Provider	X-ray: NASA/CXC/Ecole Polytechnique Federale de Lausanne, Switzerland/D.Harvey & NASA/CXC/Durham Univ/R.Massey; Optical & Lensing Map: NASA, ESA, D. Harvey (Ecole Polytechnique Federale de Lausanne, Switzerland) and R. Massey (Durham University, UK)
Source	Chandra X-ray Observatory
Short title	Dark Matter is Darker Than Once Thought
Usage terms	http://chandra.harvard.edu/photo/image_use.html
Date and time of data generation	26 March 2015
Orientation	Normal
Horizontal resolution	0.005952380952381 dpi
Vertical resolution	0.00029444444444444 dpi
File change date and time	(Macintosh)
Exif version	2.21
Color space	Uncalibrated
Software used	Adobe Photoshop CS6 (Macintosh)
Date and time of digitizing	06:29, 23 March 2015
Date metadata was last modified	07:20, 26 May 2015
Unique ID of original document	xmp.did:26CFD6480C206811808380674AED93A4
Keywords	MACSJ0416.1-2403 MACSJ0152.5-2852 MACSJ0717.5+3745 Abell 370 Abell 2744 ZwCl 1358+62
Contact information	cxcpub@cfa.harvard.edu http://chandra.harvard.edu 60 Garden St. Cambridge, MA, 02138 USA 617.496.7941
IIM version	4

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