Emission-nebula meaning

ĭ-mĭshən
A nebula that absorbs ultraviolet radiation from stars and reemits it in the visible, infrared, and radio parts of the electromagnetic spectrum.
noun
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A nebula that absorbs ionizing ultraviolet radiation from nearby hot stars or star remnants and reemits it as visible light. HII regions , planetary nebulae , and nebulae created by the explosion of supernovae are different kinds of emission nebulae.
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