Question

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?

Homework Answers

Answer #1

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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