bright nebula


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bright nebula

An emission nebula or reflection nebula as opposed to a dark nebula. See also nebula.
References in periodicals archive ?
Newcomers to deep-sky observing are warmly invited to observe the Big 5 of the African Sky, an inspirational observing project highlighting the most splendid example of each type of deep-sky object: a galaxy, a bright nebula, a dark nebula, an open cluster, and a globular cluster.
Hot Star, Bright Nebula by the EUROPEAN SOUTHERN OBSERVATORY
The boundary north of unseen B23 and B24 is "less definite than the southern boundary." The thumb that extends south-southeastwards to declination +27.5[degrees] is "all strikingly empty of stars." I found the MSA boundaries to be "pretty exact" at the narrowing northwest of the unseen bright nebula vdB 29.
The bright nebula at the southern (bottom) end is Cederblad 90, while the one above center and crossed by a prominent dark lane is van den Bergh 93.
The bright nebula extends to around 15 light years but the complete gas and dust cloud is much larger, probably covering 40 light years.
Newcomers to deep-sky observing are warmly invited to observe the "Big 5 of the African Sky", a new observing project highlighting the most splendid example of each type of deep-sky object: a galaxy, a bright nebula, a dark nebula, an open cluster, and a globular cluster.
The Horsehead, catalogued as B33, is caused by swirls of dark dust and gas, making a silhouette against the bright nebula. Some have difficulty seeing a horse's head, but to me it has always looked like the Knight chess piece or a sea-horse head.