diffuse nebula

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Related to gaseous nebula: nebulous stars

diffuse nebula

[də′fyüs ′neb·yə·lə]
(astronomy)
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.
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It was another of the objects confirmed as a gaseous nebula by Huggins, who studied it with a spectroscope in 1864.
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