Fraunhofer linesFraun·ho·fer lines
the dark lines visible in the spectrum of the sun or a star
Origin of Fraunhofer linesafter Joseph von Fraunhofer (1787-1826), Bavarian optician, who first mapped them accurately
A set of several hundred dark lines appearing against the bright background of the continuous solar spectrum and produced by absorption of light by the cooler gases in the sun's outer atmosphere at frequencies corresponding to the atomic transition frequencies of these gases.
Origin of Fraunhofer linesAfter Joseph von Fraunhofer, (1787–1826), German physicist.