You are seeing reference results for bright diffuse nebula because there's not a match on Dictionary.com.
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uk.ask.com/what-is/what_is_a_nebulae
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A nebula is a huge, diffuse cloud of gas, mostly hydrogen gas H2, It is usually visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter
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www.atlasoftheuniverse.com/nebulae.html
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Bright nebulae are usually vast concentrations of gas and dust in which stars have been or are being formed. There are three main types of bright diffuse ...
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www.atlasoftheuniverse.com/5000lys.html
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Bright Diffuse Nebulae. Many bright nebular regions are known in our galaxy. ... This is a bright emission nebula which supposedly looks like the shape of the ...
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messier.seds.org/nebula.html
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Nov 17, 2005 ... Dark Nebulae. Although none of them is in Messier's catalog, some of these objects are conspicuous. Unlike the others, the bright nebulae, ...
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www.enchantedlearning.com/subjects/astronomy/stars/nebu...
www.enchantedlearning.com/subjects/astronomy/stars/nebulae.shtml
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The Horsehead Nebula is a huge cloud of dust in space that is shaped like a horse's head. It is luminous at its edges because it is in front of a bright emission ...
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dictionary.reference.com/browse/emission+nebula
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a bright diffuse nebula that emits light as a result of ionization of its gas atoms by ultraviolet radiation, as the Orion Nebula, planetary nebulae, and supernova ...
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thenewage.com/resources/aphysical/scbright.asp
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A nebula containing a very hot star can be excited to self luminosity, resulting in what is termed an emission nebulae.
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www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Numb...
www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4457101/page/11/view/collapsed/sb/5/o/all/fpart/1
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Planetary nebulae on the otherhand are bright, concentrated areas of light that are able to pierce through that urban/suburban skyglow.
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www.azastronomy.com/diffuse-nebulae/
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Dark nebulae (called“Barnard Nebulae”) are made from dust that block light. These are seen when they are highlighted against bright emission or reflection ...
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