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emission nebula
e·mis·sion neb·u·la (plural e·mis·sion neb·u·lae)


noun 
Definition:
 
nebula emitting radiation: a cloud of interstellar gas and dust that emits light when electrons recombine with protons to form hydrogen atoms
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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