Close Encounters of the Galactic Kind (NASA, Chandra, Hubble, 10/25/11)
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Keywords: (nasa, -ray, astronomy, black, blackholes, chand, chandra, chandraxrayobservatory, close, cosmic, cosmicevolutionsurve, cosmos, encounters, european, europeansouthernobservatory, evolution, galactic, galaxy, galaxypairs, holes, hubble, hubblespacetelescope, kind, large, nasa, observatory, pairs, southern, space, surve, telescope, verylargetelescope, xraytelescope