diffuse nebula(redirected from Gaseous nebulas)
Also found in: Dictionary, Thesaurus.
diffuse nebula[də′fyüs ′neb·yə·lə]
A type of nebula ranging from huge masses presenting relatively high surface brightness down to faint, milky structures that are detectable only with long exposures and special filters; may contain both dust and gas or may be purely gaseous.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.