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天文,观测星云,我们得到星云是哪种光谱?

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天文,观测星云,我们得到星云是哪种光谱?
What type of spectrum would you expect to see from the glowing parts of the nebula?Why?
天文,观测星云,我们得到星云是哪种光谱?
H alpha (approximate wavelenth 600nm) usually has the high intensity due to the emission of Hydrogen atoms in nebula.
note:H alpha is in the region of visible light,about red light.
the question is little tricky to answer,cuz different nebula has different property.