'El Gordo' Galaxy Cluster (NASA, Chandra, Spitzer, 01/10/12)

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Photo credit: © NG Images / Alamy / Afripics
License: Licensed
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Keywords: (nasa, -ray, astronomy, bullet, bulletcluster, chandra, chandraxrayobservatory, cluster, dark, darkmatter, el, elgordo, galaxy, galaxycluster, gordo, matter, nasa, observatory, spitzer, telescope, xraytelescope