Cygnus X hosts many young stellar groupings. The combined outflows and ultraviolet radiation from the region's numerous massive stars have heated and pushed gas away from the clusters, producing cavities of hot, lower-density gas.
In this 8-micron infrared image, ridges of denser gas mark the boundaries of the cavities. Bright spots within these ridges show where stars are forming today.
Photo credit: NASA/IPAC/MSX
Note: This image was taken by the Midcourse Space Experiment (MSX) and the data processed by Infrared Processing and Analysis Center (IPAC).
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