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Distinguish between reflection nebula and emission nebula. What role do they play in stellar evolution?

Distinguish between reflection nebula and emission nebula. What role do they play in stellar evolution?

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Emission nebula (HII region) – a hot star illuminates a gas cloud, excites and/or ionizes the gas, which produces emission lines by de-excitation.

Reflection nebula – a star illuminates a gas and dust cloud, the light is reflected (scattered) by the dust. Because blue light is scattered at larger angles than red light, the nebula appears blue (Rayleigh scattering cross-section ? 1/?4)

Nebula are the star after dies they becomes beautron star or black hole.Hence play an important role in steller evolution.

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