Why might a 'natural color' ($ ext{LRGB}$) image of an emission nebula look almost entirely red?
Answer
Because hydrogen ($ ext{H} ext{alpha}$) emission is so abundant it overshines structures produced by other elements
Hydrogen is the most abundant element and emits strongly in the red end of the spectrum ($ ext{H} ext{alpha}$). In an image prioritizing overall glow, this dominant signal can mask the subtle structures caused by less abundant elements.
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