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This is the "Central America" part of the North America Nebula (NGC 7000 or Sharpless 117), usually called the Cygnus Wall. The star cluster (NGC 6997) that energizes this nebula, located beyond the top right corner of this image, is "pushing" the wall toward the bottom left. Different densities of the interstellar medium result in various speeds of movement in different sections, leading to its complex shape.
Total exposure time for this image was 7 hours (Ha:OIII:SII = 5:1:1 hours).