Absorption Nebula Definition
noun
A cloud of interstellar gas and dust that absorbs most or all of the light from luminous objects like stars behind it, appearing as an irregular dark patch. Some absorption nebulae, such as the Coalsack, are visible to the naked eye.
American Heritage
(astronomy) A dark nebula; a diffuse mass of interstellar gas and dust that absorbs all incident radiation without reemission.
Wiktionary
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