Cygnus X-1: Still a 'Star' (NASA, Chandra, 08/27/09)

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Photo credit: © NG Images / Alamy / Afripics
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Keywords: (nasa, -1, -1:, -ray, 08/27/0, astronomy, black, blackhole, chandra, chandraxrayobservatory, cygnus, cygnusx1, galaxy, hole, nasa, observatory, star, supernova, telescope, xmm-newton, xmmnewton, xraytelescope