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Message * Articles On O-type Supergiants, including Cygnus X-1, Blue Supergiant, Zeta Puppis, Zeta Orionis, Gamma Velorum, Tau Canis Majoris, 29 Canis Majoris, Alpha Camelopardalis, Hd 93129a, Sanduleak -69° 202a, X-ray Dark Star, Single X-ray Star - 1243256478 - 9781243256478