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.
References in periodicals archive ?
Arbitrary radiation never becomes black within adiabatic enclosures [72] and gases do not become black simply because they are expansive--a lesson learned from the gaseous nebula [71, p.
It was another of the objects confirmed as a gaseous nebula by Huggins, who studied it with a spectroscope in 1864.