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la (HII regions) form where star formation is going on; what produces emission of different wavelengths (or why are the regions "colorful")?...

Why ionization nebula (HII regions) form where star formation is going on; what produces emission of different wavelengths (or why are the regions "colorful")?

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These nebulae have a steady radiance of light due to the ultraviolet photons from the... View the full answer

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