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.
noun
a type of nebula that is observed by its blocking of radiation from other sources see nebula
absorption nebula
a m-ss 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 spectrum formed by electromagnetic radiation that has p-ssed through a medium in which radiation of certain frequencies is absorbed. historical examples the liquid is without colour, and gives no absorption spectrum. encyclopaedia britannica, 11th edition, volume 16, slice 7 various this colour possesses an absorption spectrum (figured at p. 55). poisons: their effects and […]
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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 h-m-geneous layer of the material under conditions in which the path of the radiation has unit length and the […]
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to flee; abscond: the old prospector absquatulated with our picks and shovel. verb (intransitive) to leave; decamp noun the action of going away suddenly and squatting somewhere; making off, decamping examples if the actress does not make an appearance soon, her fans will imagine a total absquatulation. word origin an americanism simulating a latin formulation […]
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