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emission nebula
noun
, Astronomy.
- a bright diffuse nebula that emits light as a result of ionization of its gas atoms by ultraviolet radiation, as the Orion Nebula, planetary nebulae, and supernova remnants, as the Crab Nebula.
emission nebula
emission nebula
/ ĭ-mĭsh′ən /
- 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.
- See more at nebula
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