from The American Heritage® Dictionary of the English Language, 5th Edition.
- 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy A dark nebula; a
diffusemass of interstellargas and dust that absorbsall incident radiationwithout reemission.
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