diffuse nebula

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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.
References in periodicals archive ?
Where bright nebulae abound, dark nebulae are also likely to be found.
EXPERIENCED OBSERVERS know that most bright nebulae give up subtle secrets on nights of excellent transparency and seeing.
If your goal is to take pretty pictures of bright nebulae, galaxies, and star clusters, then a digital SLR camera will produce results similar to the best film astrophotographs of a few years ago.
This is why bright nebulae are called H II ("H-two") regions, even though a hydrogen atom has only one electron to lose!
Their very unusual forms might suggest that they are not necessarily due to non-luminous nebulosity, for their forms do not correspond with those of many of the bright nebulae. Indeed their forms would be so unusual among the bright nebulae that it does not seem safe to assume that they really are simply nebulae devoid of light."
Because Capricornus is located away from the galactic plane, we really don't expect to find an abundance of open star clusters or bright nebulae. The constellation is, however, home to a notable globular cluster: M30.
Still, McKeegan believes the idea proposed by Hester's group is "a plausible and intriguing scenario." If it's true, our star went through the same growing pains that young Sun-like stars are now visibly suffering inside bright nebulae.
O'Meara's preface tells us that Caldwell's list contains 35 galaxies, 28 open clusters, 18 globular clusters, 13 planetary nebulae, 12 bright nebulae, 2 parts of the same supernovae remnant, and 1 dark nebula.