Emission nebulae get their red color from the red supergiants forming in them.

Name: Emission nebulae get their red color from the red supergiants forming in them.
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Emission nebulae get their red color primarily from hydrogen gas that is ionized by the ultraviolet light from nearby hot stars, causing it to emit light in the red part of the spectrum, specifically at the hydrogen alpha line (656.28 nm). Red supergiants are not the cause of the red color in emission nebulae.

Emission Nebulae Get Their Red Color from the Red Supergiants