| | # {{physics}},{{astronomy}} A [[spectral line]] that corresponds to the absorption of [[electromagnetic radiation]] at a specific [[wavelength]]; the [[pattern]] of such lines is characteristic of specific [[atom]]s or [[molecule]]s in the path of the radiation. | | # {{physics}},{{astronomy}} A [[spectral line]] that corresponds to the absorption of [[electromagnetic radiation]] at a specific [[wavelength]]; the [[pattern]] of such lines is characteristic of specific [[atom]]s or [[molecule]]s in the path of the radiation. |
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