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dark nebula

(absorption nebula)
(cloud that obscures stars behind it)

The term dark nebula is used for a cloud (i.e., nebula) that is dense enough to obscure EMR from behind, which can result in a portion of the sky showing no stars. The extinction can be from dust or dense gas or a combination, often star-forming regions. Radio and infrared are used to view what is inside and behind.

An example is LDN 1689.


(object type,cloud type,star formation)
http://en.wikipedia.org/wiki/Dark_nebula

Referenced by:
Barnard Catalog (Barnard)
cloud
Lynds Catalog of Dark Nebulae (LDN)
reflection nebula

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