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What do the colors of a nebula mean?

All the colors of the rainbow

Okay, so the colors of a nebula ARE pretty, but why are they there? Believe it or not, it's not God painting a picture. The pinkish red color is the color of ionized hydrogen, the blue-green, which when mixed with the pink looks purple, is the color of ionized oxygen, and the blue is light being reflected from nearby stars.

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