Three-colour image (blue = 70 μm, green = 160 μm, red = 500 μm, all maps are absolutely calibrated) of the Cygnus X complex (credit: ESA/PACS/SPIRE) oriented in RA/Dec, i.e., north to the top, east to the left. The Cyg OB2 association is located slightly above the center of the figure. The image covers a range of RA(2000) ~ 20h30m to 20h45m and Dec(2000) ~ 38° and 43°. Blue colours indicate gas heated by high-mass stars of the cluster and white colours indicate smaller H II regions that locally heat the gas and create bubble-like features. Colder extended emission mainly arising from the molecular cloud is shown in red. Numerous pillars and globules, in particular in the southern part of Cygnus X, point towards Cyg OB2.
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