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.
Image Credit: NASA/IPAC/MSX
Explanation from: https://www.nasa.gov/multimedia/imagegallery/image_feature_2119.html
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