diffuse nebula

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Related to Diffuse nebulae: planetary nebula, Dark nebula, Supernova remnants, Messier 20

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.
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