Absorption nebula

a cloud of interstellar gas and dust that absorbs and thus obscures the light from stars behind it, appearing as a dark patch in front of a bright nebula or in an otherwise bright area of sky.
a type of nebula that is observed by its blocking of radiation from other sources See nebula
absorption nebula
A mass of interstellar gas and dust that absorbs most or all of the light from the stars behind it. Absorption nebulae appear as irregular dark patches and collectively cover about two percent of the sky. Some absorption nebulae, especially the Coalsack near the constellations Centaurus and Southern Cross, are visible to the naked eye. Also called dark cloud, dark nebula. See more at nebula.
dark nebula
See absorption nebula.


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    the property of a body that determines the fraction of incident radiation or by the body. noun (physics) a measure of the ability of a material to absorb radiation, equal to the internal absorptance of a homogeneous layer of the material under conditions in which the path of the radiation has unit length and the […]

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