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Dictionary

emis'sion neb"ula

Astron.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

emission

emission spectrum

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