1. SHow do the spectra of HII regions differ from the spectra of reflection nebulae? Why? 2. How… 1 answer below »

1. SHow do the spectra of HII regions differ from the spectra of reflection nebulae? Why? 2. How is the blue color of a reflection nebula related to the blue color of the daytime sky? 3. Why are interstellar lines so narrow? 4. What factors resist the contraction of a cloud of interstellar matter?  

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