Posted on 09/19/2025 11:14:06 AM PDT by MtnClimber
Explanation: A study in contrasts, this colorful cosmic skyscape features stars, dust, and glowing gas in the vicinity of NGC 6914. The interstellar complex of nebulae lies some 6,000 light-years away, toward the high-flying northern constellation Cygnus and the plane of our Milky Way Galaxy. Obscuring interstellar dust clouds appear in silhouette while reddish hydrogen emission nebulae, along with the dusty blue reflection nebulae, fill the cosmic canvas. Ultraviolet radiation from the massive, hot, young stars of the extensive Cygnus OB2 association ionize the region's atomic hydrogen gas, producing the characteristic red glow as protons and electrons recombine. Embedded Cygnus OB2 stars also provide the blue starlight strongly reflected by the dust clouds. The over one degree wide telescopic field of view spans about 100 light-years at the estimated distance of NGC 6914.
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The statement that the hydrogen red glow is from the hydrogen atom electrons and protons recombining is not accurate. The red glow comes from the energy gap from a hydrogen atom excited state electron collapsing into the lower state and emitting a light photon with an energy release that is in the red light wave region.
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If our eyes could only see what our cameras can….
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